Python开发【第六篇】:模块,python开发第六篇,模块,用一砣代码实现
Python开发【第六篇】:模块,python开发第六篇,模块,用一砣代码实现
模块,用一砣代码实现了某个功能的代码集合。
类似于函数式编程和面向过程编程,函数式编程则完成一个功能,其他代码用来调用即可,提供了代码的重用性和代码间的耦合。而对于一个复杂的功能来,可能需要多个函数才能完成(函数又可以在不同的.py文件中),n个 .py 文件组成的代码集合就称为模块。
如:os 是系统相关的模块;file是文件操作相关的模块
模块分为三种:
自定义模块第三方模块内置模块自定义模块
1、定义模块
情景一:
情景二:
情景三:
2、导入模块
Python之所以应用越来越广泛,在一定程度上也依赖于其为程序员提供了大量的模块以供使用,如果想要使用模块,则需要导入。导入模块有一下几种方法:
1234 | import |
导入模块其实就是告诉Python解释器去解释那个py文件
导入一个py文件,解释器解释该py文件导入一个包,解释器解释该包下的 __init__.py 文件 【py2.7】那么问题来了,导入模块时是根据那个路径作为基准来进行的呢?即:sys.path
12345 | import |
如果sys.path路径列表没有你想要的路径,可以通过 sys.path.append(‘路径‘) 添加。
1234 | import |
模块
内置模块是Python自带的功能,在使用内置模块相应的功能时,需要【先导入】再【使用】
一、sys
用于提供对Python解释器相关的操作:
123456789 | sys.argv 命令行参数 |
import sysimport timedef view_bar(num, total): rate = float(num) / float(total) rate_num = int(rate * 100) r = ‘\r%d%%‘ % (rate_num, ) sys.stdout.write(r) sys.stdout.flush()if __name__ == ‘__main__‘: for i in range(0, 100): time.sleep(0.1) view_bar(i, 100)
二、os
用于提供系统级别的操作:
1234567891011121314151617181920212223242526272829 | os.getcwd() 获取当前工作目录,即当前python脚本工作的目录路径 |
三、hashlib
用于加密相关的操作,代替了md5模块和sha模块,主要提供SHA1, SHA224, SHA256, SHA384, SHA512 ,MD5 算法
12345678910111213141516171819202122232425262728293031323334 | import |
以上加密算法虽然依然非常厉害,但时候存在缺陷,即:通过撞库可以反解。所以,有必要对加密算法中添加自定义key再来做加密。
1234567 | import |
python内置还有一个 hmac 模块,它内部对我们创建 key 和 内容 进行进一步的处理然后再加密
12345 | import |
四、random
12345 | import |
import randomcheckcode = ‘‘for i in range(4): current = random.randrange(0,4) if current != i: temp = chr(random.randint(65,90)) else: temp = random.randint(0,9) checkcode += str(temp)print checkcode
五、re
python中re模块提供了正则表达式相关操作
字符:
. 匹配除换行符以外的任意字符
\w匹配字母或数字或下划线或汉字
\s匹配任意的空白符
\d匹配数字
\b匹配单词的开始或结束
^匹配字符串的开始
$匹配字符串的结束
次数:
* 重复零次或更多次
+重复一次或更多次
?重复零次或一次
{n}重复n次
{n,}重复n次或更多次
{n,m}重复n到m次
match
12345678910111213141516171819202122232425 | # match,从起始位置开始匹配,匹配成功返回一个对象,未匹配成功返回None |
# 无分组 r = re.match("h\w+", origin) print(r.group()) # 获取匹配到的所有结果 print(r.groups()) # 获取模型中匹配到的分组结果 print(r.groupdict()) # 获取模型中匹配到的分组结果 # 有分组 # 为何要有分组?提取匹配成功的指定内容(先匹配成功全部正则,再匹配成功的局部内容提取出来) r = re.match("h(\w+).*(?P<name>\d)$", origin) print(r.group()) # 获取匹配到的所有结果 print(r.groups()) # 获取模型中匹配到的分组结果 print(r.groupdict()) # 获取模型中匹配到的分组中所有执行了key的组
search
12 | # search,浏览整个字符串去匹配第一个,未匹配成功返回None |
# 无分组 r = re.search("a\w+", origin) print(r.group()) # 获取匹配到的所有结果 print(r.groups()) # 获取模型中匹配到的分组结果 print(r.groupdict()) # 获取模型中匹配到的分组结果 # 有分组 r = re.search("a(\w+).*(?P<name>\d)$", origin) print(r.group()) # 获取匹配到的所有结果 print(r.groups()) # 获取模型中匹配到的分组结果 print(r.groupdict()) # 获取模型中匹配到的分组中所有执行了key的组
findall
123 | # findall,获取非重复的匹配列表;如果有一个组则以列表形式返回,且每一个匹配均是字符串;如果模型中有多个组,则以列表形式返回,且每一个匹配均是元祖; |
# 无分组 r = re.findall("a\w+",origin) print(r) # 有分组 origin = "hello alex bcd abcd lge acd 19" r = re.findall("a((\w*)c)(d)", origin) print(r)
sub
12345678 | # sub,替换匹配成功的指定位置字符串 |
# 与分组无关 origin = "hello alex bcd alex lge alex acd 19" r = re.sub("a\w+", "999", origin, 2) print(r)
split
1234567 | # split,根据正则匹配分割字符串 |
# 无分组 origin = "hello alex bcd alex lge alex acd 19" r = re.split("alex", origin, 1) print(r) # 有分组 origin = "hello alex bcd alex lge alex acd 19" r1 = re.split("(alex)", origin, 1) print(r1) r2 = re.split("(al(ex))", origin, 1) print(r2)
IP:^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$手机号:^1[3|4|5|8][0-9]\d{8}$邮箱:[a-zA-Z0-9_-][email protected][a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+
六、序列化
Python中用于序列化的两个模块
json 用于【字符串】和 【python基本数据类型】 间进行转换pickle 用于【python特有的类型】 和 【python基本数据类型】间进行转换Json模块提供了四个功能:dumps、dump、loads、load
pickle模块提供了四个功能:dumps、dump、loads、load
七、configparser
configparser用于处理特定格式的文件,其本质上是利用open来操作文件。
# 注释1; 注释2 [section1] # 节点k1 = v1 # 值k2:v2 # 值 [section2] # 节点k1 = v1 # 值
1、获取所有节点
123456 | import |
2、获取指定节点下所有的键值对
123456 | import |
3、获取指定节点下所有的建
123456 | import |
4、获取指定节点下指定key的值
123456789101112 | import |
5、检查、删除、添加节点
1234567891011121314151617 | import |
6、检查、删除、设置指定组内的键值对
12345678910111213141516 | import |
八、XML
XML是实现不同语言或程序之间进行数据交换的协议,XML文件格式如下:
<data> <country name="Liechtenstein"> <rank updated="yes">2</rank> <year>2023</year> <gdppc>141100</gdppc> <neighbor direction="E" name="Austria" /> <neighbor direction="W" name="Switzerland" /> </country> <country name="Singapore"> <rank updated="yes">5</rank> <year>2026</year> <gdppc>59900</gdppc> <neighbor direction="N" name="Malaysia" /> </country> <country name="Panama"> <rank updated="yes">69</rank> <year>2026</year> <gdppc>13600</gdppc> <neighbor direction="W" name="Costa Rica" /> <neighbor direction="E" name="Colombia" /> </country></data>
1、解析XML
from xml.etree import ElementTree as ET# 打开文件,读取XML内容str_xml = open(‘xo.xml‘, ‘r‘).read()# 将字符串解析成xml特殊对象,root代指xml文件的根节点root = ET.XML(str_xml)
from xml.etree import ElementTree as ET# 直接解析xml文件tree = ET.parse("xo.xml")# 获取xml文件的根节点root = tree.getroot()
2、操作XML
XML格式类型是节点嵌套节点,对于每一个节点均有以下功能,以便对当前节点进行操作:
class Element: """An XML element. This class is the reference implementation of the Element interface. An element‘s length is its number of subelements. That means if you want to check if an element is truly empty, you should check BOTH its length AND its text attribute. The element tag, attribute names, and attribute values can be either bytes or strings. *tag* is the element name. *attrib* is an optional dictionary containing element attributes. *extra* are additional element attributes given as keyword arguments. Example form: <tag attrib>text<child/>...</tag>tail """ 当前节点的标签名 tag = None """The element‘s name.""" 当前节点的属性 attrib = None """Dictionary of the element‘s attributes.""" 当前节点的内容 text = None """ Text before first subelement. This is either a string or the value None. Note that if there is no text, this attribute may be either None or the empty string, depending on the parser. """ tail = None """ Text after this element‘s end tag, but before the next sibling element‘s start tag. This is either a string or the value None. Note that if there was no text, this attribute may be either None or an empty string, depending on the parser. """ def __init__(self, tag, attrib={}, **extra): if not isinstance(attrib, dict): raise TypeError("attrib must be dict, not %s" % ( attrib.__class__.__name__,)) attrib = attrib.copy() attrib.update(extra) self.tag = tag self.attrib = attrib self._children = [] def __repr__(self): return "<%s %r at %#x>" % (self.__class__.__name__, self.tag, id(self)) def makeelement(self, tag, attrib): 创建一个新节点 """Create a new element with the same type. *tag* is a string containing the element name. *attrib* is a dictionary containing the element attributes. Do not call this method, use the SubElement factory function instead. """ return self.__class__(tag, attrib) def copy(self): """Return copy of current element. This creates a shallow copy. Subelements will be shared with the original tree. """ elem = self.makeelement(self.tag, self.attrib) elem.text = self.text elem.tail = self.tail elem[:] = self return elem def __len__(self): return len(self._children) def __bool__(self): warnings.warn( "The behavior of this method will change in future versions. " "Use specific ‘len(elem)‘ or ‘elem is not None‘ test instead.", FutureWarning, stacklevel=2 ) return len(self._children) != 0 # emulate old behaviour, for now def __getitem__(self, index): return self._children[index] def __setitem__(self, index, element): # if isinstance(index, slice): # for elt in element: # assert iselement(elt) # else: # assert iselement(element) self._children[index] = element def __delitem__(self, index): del self._children[index] def append(self, subelement): 为当前节点追加一个子节点 """Add *subelement* to the end of this element. The new element will appear in document order after the last existing subelement (or directly after the text, if it‘s the first subelement), but before the end tag for this element. """ self._assert_is_element(subelement) self._children.append(subelement) def extend(self, elements): 为当前节点扩展 n 个子节点 """Append subelements from a sequence. *elements* is a sequence with zero or more elements. """ for element in elements: self._assert_is_element(element) self._children.extend(elements) def insert(self, index, subelement): 在当前节点的子节点中插入某个节点,即:为当前节点创建子节点,然后插入指定位置 """Insert *subelement* at position *index*.""" self._assert_is_element(subelement) self._children.insert(index, subelement) def _assert_is_element(self, e): # Need to refer to the actual Python implementation, not the # shadowing C implementation. if not isinstance(e, _Element_Py): raise TypeError(‘expected an Element, not %s‘ % type(e).__name__) def remove(self, subelement): 在当前节点在子节点中删除某个节点 """Remove matching subelement. Unlike the find methods, this method compares elements based on identity, NOT ON tag value or contents. To remove subelements by other means, the easiest way is to use a list comprehension to select what elements to keep, and then use slice assignment to update the parent element. ValueError is raised if a matching element could not be found. """ # assert iselement(element) self._children.remove(subelement) def getchildren(self): 获取所有的子节点(废弃) """(Deprecated) Return all subelements. Elements are returned in document order. """ warnings.warn( "This method will be removed in future versions. " "Use ‘list(elem)‘ or iteration over elem instead.", DeprecationWarning, stacklevel=2 ) return self._children def find(self, path, namespaces=None): 获取第一个寻找到的子节点 """Find first matching element by tag name or path. *path* is a string having either an element tag or an XPath, *namespaces* is an optional mapping from namespace prefix to full name. Return the first matching element, or None if no element was found. """ return ElementPath.find(self, path, namespaces) def findtext(self, path, default=None, namespaces=None): 获取第一个寻找到的子节点的内容 """Find text for first matching element by tag name or path. *path* is a string having either an element tag or an XPath, *default* is the value to return if the element was not found, *namespaces* is an optional mapping from namespace prefix to full name. Return text content of first matching element, or default value if none was found. Note that if an element is found having no text content, the empty string is returned. """ return ElementPath.findtext(self, path, default, namespaces) def findall(self, path, namespaces=None): 获取所有的子节点 """Find all matching subelements by tag name or path. *path* is a string having either an element tag or an XPath, *namespaces* is an optional mapping from namespace prefix to full name. Returns list containing all matching elements in document order. """ return ElementPath.findall(self, path, namespaces) def iterfind(self, path, namespaces=None): 获取所有指定的节点,并创建一个迭代器(可以被for循环) """Find all matching subelements by tag name or path. *path* is a string having either an element tag or an XPath, *namespaces* is an optional mapping from namespace prefix to full name. Return an iterable yielding all matching elements in document order. """ return ElementPath.iterfind(self, path, namespaces) def clear(self): 清空节点 """Reset element. This function removes all subelements, clears all attributes, and sets the text and tail attributes to None. """ self.attrib.clear() self._children = [] self.text = self.tail = None def get(self, key, default=None): 获取当前节点的属性值 """Get element attribute. Equivalent to attrib.get, but some implementations may handle this a bit more efficiently. *key* is what attribute to look for, and *default* is what to return if the attribute was not found. Returns a string containing the attribute value, or the default if attribute was not found. """ return self.attrib.get(key, default) def set(self, key, value): 为当前节点设置属性值 """Set element attribute. Equivalent to attrib[key] = value, but some implementations may handle this a bit more efficiently. *key* is what attribute to set, and *value* is the attribute value to set it to. """ self.attrib[key] = value def keys(self): 获取当前节点的所有属性的 key """Get list of attribute names. Names are returned in an arbitrary order, just like an ordinary Python dict. Equivalent to attrib.keys() """ return self.attrib.keys() def items(self): 获取当前节点的所有属性值,每个属性都是一个键值对 """Get element attributes as a sequence. The attributes are returned in arbitrary order. Equivalent to attrib.items(). Return a list of (name, value) tuples. """ return self.attrib.items() def iter(self, tag=None): 在当前节点的子孙中根据节点名称寻找所有指定的节点,并返回一个迭代器(可以被for循环)。 """Create tree iterator. The iterator loops over the element and all subelements in document order, returning all elements with a matching tag. If the tree structure is modified during iteration, new or removed elements may or may not be included. To get a stable set, use the list() function on the iterator, and loop over the resulting list. *tag* is what tags to look for (default is to return all elements) Return an iterator containing all the matching elements. """ if tag == "*": tag = None if tag is None or self.tag == tag: yield self for e in self._children: yield from e.iter(tag) # compatibility def getiterator(self, tag=None): # Change for a DeprecationWarning in 1.4 warnings.warn( "This method will be removed in future versions. " "Use ‘elem.iter()‘ or ‘list(elem.iter())‘ instead.", PendingDeprecationWarning, stacklevel=2 ) return list(self.iter(tag)) def itertext(self): 在当前节点的子孙中根据节点名称寻找所有指定的节点的内容,并返回一个迭代器(可以被for循环)。 """Create text iterator. The iterator loops over the element and all subelements in document order, returning all inner text. """ tag = self.tag if not isinstance(tag, str) and tag is not None: return if self.text: yield self.text for e in self: yield from e.itertext() if e.tail: yield e.tail
由于 每个节点 都具有以上的方法,并且在上一步骤中解析时均得到了root(xml文件的根节点),so 可以利用以上方法进行操作xml文件。
a.遍历XML文档的所有内容
from xml.etree import ElementTree as ET############ 解析方式一 ############"""# 打开文件,读取XML内容str_xml = open(‘xo.xml‘, ‘r‘).read()# 将字符串解析成xml特殊对象,root代指xml文件的根节点root = ET.XML(str_xml)"""############ 解析方式二 ############# 直接解析xml文件tree = ET.parse("xo.xml")# 获取xml文件的根节点root = tree.getroot()### 操作# 顶层标签print(root.tag)# 遍历XML文档的第二层for child in root: # 第二层节点的标签名称和标签属性 print(child.tag, child.attrib) # 遍历XML文档的第三层 for i in child: # 第二层节点的标签名称和内容 print(i.tag,i.text)b、遍历XML中指定的节点
from xml.etree import ElementTree as ET############ 解析方式一 ############"""# 打开文件,读取XML内容str_xml = open(‘xo.xml‘, ‘r‘).read()# 将字符串解析成xml特殊对象,root代指xml文件的根节点root = ET.XML(str_xml)"""############ 解析方式二 ############# 直接解析xml文件tree = ET.parse("xo.xml")# 获取xml文件的根节点root = tree.getroot()### 操作# 顶层标签print(root.tag)# 遍历XML中所有的year节点for node in root.iter(‘year‘): # 节点的标签名称和内容 print(node.tag, node.text)c、修改节点内容
由于修改的节点时,均是在内存中进行,其不会影响文件中的内容。所以,如果想要修改,则需要重新将内存中的内容写到文件。
from xml.etree import ElementTree as ET############ 解析方式一 ############# 打开文件,读取XML内容str_xml = open(‘xo.xml‘, ‘r‘).read()# 将字符串解析成xml特殊对象,root代指xml文件的根节点root = ET.XML(str_xml)############ 操作 ############# 顶层标签print(root.tag)# 循环所有的year节点for node in root.iter(‘year‘): # 将year节点中的内容自增一 new_year = int(node.text) + 1 node.text = str(new_year) # 设置属性 node.set(‘name‘, ‘alex‘) node.set(‘age‘, ‘18‘) # 删除属性 del node.attrib[‘name‘]############ 保存文件 ############tree = ET.ElementTree(root)tree.write("newnew.xml", encoding=‘utf-8‘)from xml.etree import ElementTree as ET############ 解析方式二 ############# 直接解析xml文件tree = ET.parse("xo.xml")# 获取xml文件的根节点root = tree.getroot()############ 操作 ############# 顶层标签print(root.tag)# 循环所有的year节点for node in root.iter(‘year‘): # 将year节点中的内容自增一 new_year = int(node.text) + 1 node.text = str(new_year) # 设置属性 node.set(‘name‘, ‘alex‘) node.set(‘age‘, ‘18‘) # 删除属性 del node.attrib[‘name‘]############ 保存文件 ############tree.write("newnew.xml", encoding=‘utf-8‘)d、删除节点
from xml.etree import ElementTree as ET############ 解析字符串方式打开 ############# 打开文件,读取XML内容str_xml = open(‘xo.xml‘, ‘r‘).read()# 将字符串解析成xml特殊对象,root代指xml文件的根节点root = ET.XML(str_xml)############ 操作 ############# 顶层标签print(root.tag)# 遍历data下的所有country节点for country in root.findall(‘country‘): # 获取每一个country节点下rank节点的内容 rank = int(country.find(‘rank‘).text) if rank > 50: # 删除指定country节点 root.remove(country)############ 保存文件 ############tree = ET.ElementTree(root)tree.write("newnew.xml", encoding=‘utf-8‘)from xml.etree import ElementTree as ET############ 解析文件方式 ############# 直接解析xml文件tree = ET.parse("xo.xml")# 获取xml文件的根节点root = tree.getroot()############ 操作 ############# 顶层标签print(root.tag)# 遍历data下的所有country节点for country in root.findall(‘country‘): # 获取每一个country节点下rank节点的内容 rank = int(country.find(‘rank‘).text) if rank > 50: # 删除指定country节点 root.remove(country)############ 保存文件 ############tree.write("newnew.xml", encoding=‘utf-8‘)
3、创建XML文档
from xml.etree import ElementTree as ET# 创建根节点root = ET.Element("famliy")# 创建节点大儿子son1 = ET.Element(‘son‘, {‘name‘: ‘儿1‘})# 创建小儿子son2 = ET.Element(‘son‘, {"name": ‘儿2‘})# 在大儿子中创建两个孙子grandson1 = ET.Element(‘grandson‘, {‘name‘: ‘儿11‘})grandson2 = ET.Element(‘grandson‘, {‘name‘: ‘儿12‘})son1.append(grandson1)son1.append(grandson2)# 把儿子添加到根节点中root.append(son1)root.append(son1)tree = ET.ElementTree(root)tree.write(‘oooo.xml‘,encoding=‘utf-8‘, short_empty_elements=False)
from xml.etree import ElementTree as ET# 创建根节点root = ET.Element("famliy")# 创建大儿子# son1 = ET.Element(‘son‘, {‘name‘: ‘儿1‘})son1 = root.makeelement(‘son‘, {‘name‘: ‘儿1‘})# 创建小儿子# son2 = ET.Element(‘son‘, {"name": ‘儿2‘})son2 = root.makeelement(‘son‘, {"name": ‘儿2‘})# 在大儿子中创建两个孙子# grandson1 = ET.Element(‘grandson‘, {‘name‘: ‘儿11‘})grandson1 = son1.makeelement(‘grandson‘, {‘name‘: ‘儿11‘})# grandson2 = ET.Element(‘grandson‘, {‘name‘: ‘儿12‘})grandson2 = son1.makeelement(‘grandson‘, {‘name‘: ‘儿12‘})son1.append(grandson1)son1.append(grandson2)# 把儿子添加到根节点中root.append(son1)root.append(son1)tree = ET.ElementTree(root)tree.write(‘oooo.xml‘,encoding=‘utf-8‘, short_empty_elements=False)
from xml.etree import ElementTree as ET# 创建根节点root = ET.Element("famliy")# 创建节点大儿子son1 = ET.SubElement(root, "son", attrib={‘name‘: ‘儿1‘})# 创建小儿子son2 = ET.SubElement(root, "son", attrib={"name": "儿2"})# 在大儿子中创建一个孙子grandson1 = ET.SubElement(son1, "age", attrib={‘name‘: ‘儿11‘})grandson1.text = ‘孙子‘et = ET.ElementTree(root) #生成文档对象et.write("test.xml", encoding="utf-8", xml_declaration=True, short_empty_elements=False)
由于原生保存的XML时默认无缩进,如果想要设置缩进的话, 需要修改保存方式:
from xml.etree import ElementTree as ETfrom xml.dom import minidomdef prettify(elem): """将节点转换成字符串,并添加缩进。 """ rough_string = ET.tostring(elem, ‘utf-8‘) reparsed = minidom.parseString(rough_string) return reparsed.toprettyxml(indent="\t")# 创建根节点root = ET.Element("famliy")# 创建大儿子# son1 = ET.Element(‘son‘, {‘name‘: ‘儿1‘})son1 = root.makeelement(‘son‘, {‘name‘: ‘儿1‘})# 创建小儿子# son2 = ET.Element(‘son‘, {"name": ‘儿2‘})son2 = root.makeelement(‘son‘, {"name": ‘儿2‘})# 在大儿子中创建两个孙子# grandson1 = ET.Element(‘grandson‘, {‘name‘: ‘儿11‘})grandson1 = son1.makeelement(‘grandson‘, {‘name‘: ‘儿11‘})# grandson2 = ET.Element(‘grandson‘, {‘name‘: ‘儿12‘})grandson2 = son1.makeelement(‘grandson‘, {‘name‘: ‘儿12‘})son1.append(grandson1)son1.append(grandson2)# 把儿子添加到根节点中root.append(son1)root.append(son1)raw_str = prettify(root)f = open("xxxoo.xml",‘w‘,encoding=‘utf-8‘)f.write(raw_str)f.close()
4、命名空间
详细介绍,猛击这里
from xml.etree import ElementTree as ETET.register_namespace(‘com‘,"http://www.company.com") #some name# build a tree structureroot = ET.Element("{http://www.company.com}STUFF")body = ET.SubElement(root, "{http://www.company.com}MORE_STUFF", attrib={"{http://www.company.com}hhh": "123"})body.text = "STUFF EVERYWHERE!"# wrap it in an ElementTree instance, and save as XMLtree = ET.ElementTree(root)tree.write("page.xml", xml_declaration=True, encoding=‘utf-8‘, method="xml")
九、requests
Python标准库中提供了:urllib等模块以供Http请求,但是,它的 API 太渣了。它是为另一个时代、另一个互联网所创建的。它需要巨量的工作,甚至包括各种方法覆盖,来完成最简单的任务。
import urllib.requestf = urllib.request.urlopen(‘http://www.webxml.com.cn//webservices/qqOnlineWebService.asmx/qqCheckOnline?qqCode=424662508‘)result = f.read().decode(‘utf-8‘)
import urllib.requestreq = urllib.request.Request(‘http://www.example.com/‘)req.add_header(‘Referer‘, ‘http://www.python.org/‘)r = urllib.request.urlopen(req)result = f.read().decode(‘utf-8‘)
注:更多见Python官方文档:https://docs.python.org/3.5/library/urllib.request.html#module-urllib.request
Requests 是使用 Apache2 Licensed 许可证的 基于Python开发的HTTP 库,其在Python内置模块的基础上进行了高度的封装,从而使得Pythoner进行网络请求时,变得美好了许多,使用Requests可以轻而易举的完成浏览器可有的任何操作。
1、安装模块
1 | pip3 install requests |
2、使用模块
# 1、无参数实例 import requests ret = requests.get(‘https://github.com/timeline.json‘) print(ret.url)print(ret.text) # 2、有参数实例 import requests payload = {‘key1‘: ‘value1‘, ‘key2‘: ‘value2‘}ret = requests.get("http://httpbin.org/get", params=payload) print(ret.url)print(ret.text)
# 1、基本POST实例 import requests payload = {‘key1‘: ‘value1‘, ‘key2‘: ‘value2‘}ret = requests.post("http://httpbin.org/post", data=payload) print(ret.text) # 2、发送请求头和数据实例 import requestsimport json url = ‘https://api.github.com/some/endpoint‘payload = {‘some‘: ‘data‘}headers = {‘content-type‘: ‘application/json‘} ret = requests.post(url, data=json.dumps(payload), headers=headers) print(ret.text)print(ret.cookies)
requests.get(url, params=None, **kwargs)requests.post(url, data=None, json=None, **kwargs)requests.put(url, data=None, **kwargs)requests.head(url, **kwargs)requests.delete(url, **kwargs)requests.patch(url, data=None, **kwargs)requests.options(url, **kwargs) # 以上方法均是在此方法的基础上构建requests.request(method, url, **kwargs)
更多requests模块相关的文档见:http://cn.python-requests.org/zh_CN/latest/
3、Http请求和XML实例
实例:检测QQ账号是否在线
import urllibimport requestsfrom xml.etree import ElementTree as ET# 使用内置模块urllib发送HTTP请求,或者XML格式内容"""f = urllib.request.urlopen(‘http://www.webxml.com.cn//webservices/qqOnlineWebService.asmx/qqCheckOnline?qqCode=424662508‘)result = f.read().decode(‘utf-8‘)"""# 使用第三方模块requests发送HTTP请求,或者XML格式内容r = requests.get(‘http://www.webxml.com.cn//webservices/qqOnlineWebService.asmx/qqCheckOnline?qqCode=424662508‘)result = r.text# 解析XML格式内容node = ET.XML(result)# 获取内容if node.text == "Y": print("在线")else: print("离线")
实例:查看火车停靠信息
import urllibimport requestsfrom xml.etree import ElementTree as ET# 使用内置模块urllib发送HTTP请求,或者XML格式内容"""f = urllib.request.urlopen(‘http://www.webxml.com.cn/WebServices/TrainTimeWebService.asmx/getDetailInfoByTrainCode?TrainCode=G666&UserID=‘)result = f.read().decode(‘utf-8‘)"""# 使用第三方模块requests发送HTTP请求,或者XML格式内容r = requests.get(‘http://www.webxml.com.cn/WebServices/TrainTimeWebService.asmx/getDetailInfoByTrainCode?TrainCode=G666&UserID=‘)result = r.text# 解析XML格式内容root = ET.XML(result)for node in root.iter(‘TrainDetailInfo‘): print(node.find(‘TrainStation‘).text,node.find(‘StartTime‘).text,node.tag,node.attrib)
注:更多接口猛击这里
十、logging
用于便捷记录日志且线程安全的模块
1、单文件日志
1234567891011121314 | import |
日志等级:
CRITICAL = 50FATAL = CRITICALERROR = 40WARNING = 30WARN = WARNINGINFO = 20DEBUG = 10NOTSET = 0
注:只有【当前写等级】大于【日志等级】时,日志文件才被记录。
日志记录格式:
2、多文件日志
对于上述记录日志的功能,只能将日志记录在单文件中,如果想要设置多个日志文件,logging.basicConfig将无法完成,需要自定义文件和日志操作对象。
# 定义文件file_1_1 = logging.FileHandler(‘l1_1.log‘, ‘a‘, encoding=‘utf-8‘)fmt = logging.Formatter(fmt="%(asctime)s - %(name)s - %(levelname)s -%(module)s: %(message)s")file_1_1.setFormatter(fmt)file_1_2 = logging.FileHandler(‘l1_2.log‘, ‘a‘, encoding=‘utf-8‘)fmt = logging.Formatter()file_1_2.setFormatter(fmt)# 定义日志logger1 = logging.Logger(‘s1‘, level=logging.ERROR)logger1.addHandler(file_1_1)logger1.addHandler(file_1_2)# 写日志logger1.critical(‘1111‘)
# 定义文件file_2_1 = logging.FileHandler(‘l2_1.log‘, ‘a‘)fmt = logging.Formatter()file_2_1.setFormatter(fmt)# 定义日志logger2 = logging.Logger(‘s2‘, level=logging.INFO)logger2.addHandler(file_2_1)
如上述创建的两个日志对象
当使用【logger1】写日志时,会将相应的内容写入 l1_1.log 和 l1_2.log 文件中当使用【logger2】写日志时,会将相应的内容写入 l2_1.log 文件中十一、系统命令
可以执行shell命令的相关模块和函数有:
os.systemos.spawn*os.popen* --废弃popen2.* --废弃commands.* --废弃,3.x中被移除import commandsresult = commands.getoutput(‘cmd‘)result = commands.getstatus(‘cmd‘)result = commands.getstatusoutput(‘cmd‘)
以上执行shell命令的相关的模块和函数的功能均在 subprocess 模块中实现,并提供了更丰富的功能。
call
执行命令,返回状态码
12 | ret |
check_call
执行命令,如果执行状态码是 0 ,则返回0,否则抛异常
12 | subprocess.check_call([ |
check_output
执行命令,如果状态码是 0 ,则返回执行结果,否则抛异常
12 | subprocess.check_output([ |
subprocess.Popen(...)
用于执行复杂的系统命令
参数:
args:shell命令,可以是字符串或者序列类型(如:list,元组)bufsize:指定缓冲。0 无缓冲,1 行缓冲,其他 缓冲区大小,负值 系统缓冲stdin, stdout, stderr:分别表示程序的标准输入、输出、错误句柄preexec_fn:只在Unix平台下有效,用于指定一个可执行对象(callable object),它将在子进程运行之前被调用close_sfs:在windows平台下,如果close_fds被设置为True,则新创建的子进程将不会继承父进程的输入、输出、错误管道。所以不能将close_fds设置为True同时重定向子进程的标准输入、输出与错误(stdin, stdout, stderr)。shell:同上cwd:用于设置子进程的当前目录env:用于指定子进程的环境变量。如果env = None,子进程的环境变量将从父进程中继承。universal_newlines:不同系统的换行符不同,True -> 同意使用 \nstartupinfo与createionflags只在windows下有效
将被传递给底层的CreateProcess()函数,用于设置子进程的一些属性,如:主窗口的外观,进程的优先级等等
import subprocessret1 = subprocess.Popen(["mkdir","t1"])ret2 = subprocess.Popen("mkdir t2", shell=True)
终端输入的命令分为两种:
输入即可得到输出,如:ifconfig输入进行某环境,依赖再输入,如:pythonimport subprocessobj = subprocess.Popen("mkdir t3", shell=True, cwd=‘/home/dev‘,)
import subprocessobj = subprocess.Popen(["python"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)obj.stdin.write("print(1)\n")obj.stdin.write("print(2)")obj.stdin.close()cmd_out = obj.stdout.read()obj.stdout.close()cmd_error = obj.stderr.read()obj.stderr.close()print(cmd_out)print(cmd_error)
import subprocessobj = subprocess.Popen(["python"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)obj.stdin.write("print(1)\n")obj.stdin.write("print(2)")out_error_list = obj.communicate()print(out_error_list)
import subprocessobj = subprocess.Popen(["python"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=True)out_error_list = obj.communicate(‘print("hello")‘)print(out_error_list)
十二、shutil
高级的 文件、文件夹、压缩包 处理模块
shutil.copyfileobj(fsrc, fdst[, length])
将文件内容拷贝到另一个文件中
123 | import |
shutil.copyfile(src, dst)
拷贝文件
1 | shutil.copyfile( |
shutil.copymode(src, dst)
仅拷贝权限。内容、组、用户均不变
1 | shutil.copymode( |
shutil.copystat(src, dst)
仅拷贝状态的信息,包括:mode bits, atime, mtime, flags
1 | shutil.copystat( |
shutil.copy(src, dst)
拷贝文件和权限
123 | import |
shutil.copy2(src, dst)
拷贝文件和状态信息
123 | import |
shutil.ignore_patterns(*patterns)
shutil.copytree(src, dst, symlinks=False, ignore=None)
递归的去拷贝文件夹
123 | import |
import shutilshutil.copytree(‘f1‘, ‘f2‘, symlinks=True, ignore=shutil.ignore_patterns(‘*.pyc‘, ‘tmp*‘))
shutil.rmtree(path[, ignore_errors[, onerror]])
递归的去删除文件
123 | import |
shutil.move(src, dst)
递归的去移动文件,它类似mv命令,其实就是重命名。
123 | import |
shutil.make_archive(base_name, format,...)
创建压缩包并返回文件路径,例如:zip、tar
创建压缩包并返回文件路径,例如:zip、tar
base_name: 压缩包的文件名,也可以是压缩包的路径。只是文件名时,则保存至当前目录,否则保存至指定路径,如:www =>保存至当前路径
如:/Users/wupeiqi/www =>保存至/Users/wupeiqi/format:压缩包种类,“zip”, “tar”, “bztar”,“gztar”root_dir:要压缩的文件夹路径(默认当前目录)owner:用户,默认当前用户group:组,默认当前组logger:用于记录日志,通常是logging.Logger对象
12345678 | #将 /Users/wupeiqi/Downloads/test 下的文件打包放置当前程序目录 |
shutil 对压缩包的处理是调用 ZipFile 和 TarFile 两个模块来进行的,详细:
import zipfile# 压缩z = zipfile.ZipFile(‘laxi.zip‘, ‘w‘)z.write(‘a.log‘)z.write(‘data.data‘)z.close()# 解压z = zipfile.ZipFile(‘laxi.zip‘, ‘r‘)z.extractall()z.close()
import tarfile# 压缩tar = tarfile.open(‘your.tar‘,‘w‘)tar.add(‘/Users/wupeiqi/PycharmProjects/bbs2.log‘, arcname=‘bbs2.log‘)tar.add(‘/Users/wupeiqi/PycharmProjects/cmdb.log‘, arcname=‘cmdb.log‘)tar.close()# 解压tar = tarfile.open(‘your.tar‘,‘r‘)tar.extractall() # 可设置解压地址tar.close()
十三、paramiko
paramiko是一个用于做远程控制的模块,使用该模块可以对远程服务器进行命令或文件操作,值得一说的是,fabric和ansible内部的远程管理就是使用的paramiko来现实。
1、下载安装
123 | pycrypto,由于 paramiko 模块内部依赖pycrypto,所以先下载安装pycrypto |
2、模块使用
#!/usr/bin/env python#coding:utf-8import paramikossh = paramiko.SSHClient()ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())ssh.connect(‘192.168.1.108‘, 22, ‘alex‘, ‘123‘)stdin, stdout, stderr = ssh.exec_command(‘df‘)print stdout.read()ssh.close();
import paramikoprivate_key_path = ‘/home/auto/.ssh/id_rsa‘key = paramiko.RSAKey.from_private_key_file(private_key_path)ssh = paramiko.SSHClient()ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())ssh.connect(‘主机名 ‘, 端口, ‘用户名‘, key)stdin, stdout, stderr = ssh.exec_command(‘df‘)print stdout.read()ssh.close()
import os,sysimport paramikot = paramiko.Transport((‘182.92.219.86‘,22))t.connect(username=‘wupeiqi‘,password=‘123‘)sftp = paramiko.SFTPClient.from_transport(t)sftp.put(‘/tmp/test.py‘,‘/tmp/test.py‘) t.close()import os,sysimport paramikot = paramiko.Transport((‘182.92.219.86‘,22))t.connect(username=‘wupeiqi‘,password=‘123‘)sftp = paramiko.SFTPClient.from_transport(t)sftp.get(‘/tmp/test.py‘,‘/tmp/test2.py‘)t.close()
import paramikopravie_key_path = ‘/home/auto/.ssh/id_rsa‘key = paramiko.RSAKey.from_private_key_file(pravie_key_path)t = paramiko.Transport((‘182.92.219.86‘,22))t.connect(username=‘wupeiqi‘,pkey=key)sftp = paramiko.SFTPClient.from_transport(t)sftp.put(‘/tmp/test3.py‘,‘/tmp/test3.py‘) t.close()import paramikopravie_key_path = ‘/home/auto/.ssh/id_rsa‘key = paramiko.RSAKey.from_private_key_file(pravie_key_path)t = paramiko.Transport((‘182.92.219.86‘,22))t.connect(username=‘wupeiqi‘,pkey=key)sftp = paramiko.SFTPClient.from_transport(t)sftp.get(‘/tmp/test3.py‘,‘/tmp/test4.py‘) t.close()
十四、time
时间相关的操作,时间有三种表示方式:
时间戳 1970年1月1日之后的秒,即:time.time()格式化的字符串 2014-11-11 11:11, 即:time.strftime(‘%Y-%m-%d‘)结构化时间 元组包含了:年、日、星期等... time.struct_time 即:time.localtime()12345678910111213141516171819202122232425 | print |
%Y Year with century as a decimal number. %m Month as a decimal number [01,12]. %d Day of the month as a decimal number [01,31]. %H Hour (24-hour clock) as a decimal number [00,23]. %M Minute as a decimal number [00,59]. %S Second as a decimal number [00,61]. %z Time zone offset from UTC. %a Locale‘s abbreviated weekday name. %A Locale‘s full weekday name. %b Locale‘s abbreviated month name. %B Locale‘s full month name. %c Locale‘s appropriate date and time representation. %I Hour (12-hour clock) as a decimal number [01,12]. %p Locale‘s equivalent of either AM or PM.
练习题:
1、通过HTTP请求和XML实现获取电视节目
API:http://www.webxml.com.cn/webservices/ChinaTVprogramWebService.asmx
2、通过HTTP请求和JSON实现获取天气状况
API:http://wthrcdn.etouch.cn/weather_mini?city=北京
Python开发【第六篇】:模块
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