模块 2 处理xml等配置文件压缩包处理类面向对象

Posted 2020-07-29

 

一、模块

1.configparser

xxoo文件

# 注释1
;  注释2
 
[section1] # 节点
k1 = v1    # 值
k2:v2       # 值
 
[section2] # 节点
k1 = v1    # 值

 

显示

#显示所有的节点
import configparser
config = configparser.ConfigParser()
config.read(‘xxoo‘, encoding=‘utf-8‘)
ret = config.sections()                       
print(ret)

#以下为执行结果
[‘section1‘, ‘section2‘]

#显示节点key 和v
import configparser
config = configparser.ConfigParser()
config.read(‘xxoo‘, encoding=‘utf-8‘)
ret = config.items(‘section1‘)
print(ret)

#以下为执行结果：
[(‘k1‘, ‘v1    # 值‘), (‘k2‘, ‘v2       # 值‘)]

 

#显示节点中key
import configparser
config = configparser.ConfigParser()
config.read(‘xxoo‘, encoding=‘utf-8‘)
ret = config.options(‘section1‘)
print(ret)
#以下为执行结果
[‘k1‘, ‘k2‘]

#显示节点指定key对应vall
import configparser
config = configparser.ConfigParser()
config.read(‘xxoo‘, encoding=‘utf-8‘)

v = config.get(‘section1‘, ‘k1‘)
# v = config.getint(‘section1‘, ‘k1‘)                  #int格式输出
# v = config.getfloat(‘section1‘, ‘k1‘)               #float格式输出
# v = config.getboolean(‘section1‘, ‘k1‘)         #boolean格式输出

print (v)

#以下为执行结果 v1 # 值

 

 

import configparser

config = configparser.ConfigParser()
config.read(‘xxoo‘, encoding=‘utf-8‘)


# 检查
has_sec = config.has_section(‘section1‘)
print(has_sec)

# 添加节点
config.add_section("SEC_1")
config.write(open(‘xxoo‘, ‘w‘,encoding=‘utf-8‘))

# 删除节点
config.remove_section("SEC_1")
config.write(open(‘xxoo‘, ‘w‘,encoding=‘utf-8‘))



import configparser

config = configparser.ConfigParser()
config.read(‘xxoo‘, encoding=‘utf-8‘)

# 检查
has_opt = config.has_option(‘section1‘, ‘k1‘)
print(has_opt)
#
# 删除
config.remove_option(‘section1‘, ‘k1‘)
config.write(open(‘xxoo‘, ‘w‘ ,encoding=‘utf-8‘))

# 设置
config.set(‘section1‘, ‘k10‘, "123")
config.write(open(‘xxoo‘, ‘w‘,encoding=‘utf-8‘))

 

 

 

2.ElementTree 模块   

xml文件操作

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

节点功能一览表

　　

以下为xx.xml

<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>

 

from xml.etree  import ElementTree as ET

tree = ET.parse(‘xx.xml‘)
root = tree.getroot()

for  child in root:
    print(child.tag,child.attrib)
    for gradechild in child:
        print(gradechild.tag,gradechild.text)


#输出：
country {‘name‘: ‘Liechtenstein‘}
rank 2
year 2023
gdppc 141100
neighbor None
neighbor None
country {‘name‘: ‘Singapore‘}
rank 5
year 2026
gdppc 59900
neighbor None
country {‘name‘: ‘Panama‘}
rank 69
year 2026
gdppc 13600
neighbor None
neighbor None

 http://www.cnblogs.com/wupeiqi/articles/5501365.html

3、压缩包的处理

1.处理zip包

import zipfile
# 压缩    
#将两个文件追加到laxi.zip
z = zipfile.ZipFile(‘laxi.zip‘, ‘a‘)
z.write(‘newnew.xml‘)
z.write(‘xo.xml‘)
z.close()

# 解压  
#将压缩包全部解压
z = zipfile.ZipFile(‘laxi.zip‘, ‘r‘)
z.extractall()

#列出压缩包里的文件
for item in z.namelist():
    print(item,type(item))

#单独解压某个文件
z.extract("new.xml")
z.close()

 

2.tar包

import tarfile

#压缩
#添加文件到tar包
tar = tarfile.open(‘your.tar‘,‘w‘)
tar.add(‘s1.py‘, arcname=‘ssss.py‘)
tar.add(‘s2.py‘, arcname=‘cmdb.py‘)
tar.close()

# 解压
#解压所有文件
tar = tarfile.open(‘your.tar‘,‘r‘)
tar.extractall()  # 可设置解压地址
#展示tar包里的内容
for item in tar.getmembers():
    print(item,type(item))
#解压某个文件
obj = tar.getmember("ssss.py")
tar.extract(obj)

tar.close()

 3 subprocess  

import subprocess
ret = subprocess.call(["ls", "-l"], shell=False)
ret = subprocess.call("ls -l", shell=True)

subprocess.check_output("exit 1", shell=True)

 

三、类

1.类-封装

class c1:

    def __init__(self,name,obj):
        self.name = name
        self.obj = obj

class c2:

    def __init__(self,name,age):
        self.name = name
        self.age = age

    def show(self):
        print(self.name)
        return 123

class c3:
    def __init__(self, a1):
        self.money = 123
        self.aaa = a1


c2_obj = c2(‘aa‘, 11)
# c2_obj是c2类型
# - name = "aa"
# - age = 11
c1_obj = c1("alex", c2_obj)
# c1_obj 是c1 类型
# - name = "alex"
# - obj = c2_obj
c3_obj = c3(c1_obj)

# 使用c3_obj执行show方法
ret = c3_obj.aaa.obj.show()
print(ret)

#以下执行结果
aa
123

 

2.类-继承

class F1: # 父类，基类
    def show(self):
        print(‘show‘)

    def foo(self):
        print(self.name)

class F2(F1): # 子类，派生类
    def __init__(self, name):
        self.name = name

    def bar(self):
        print(‘bar‘)
    def show(self):
        print(‘F2.show‘)

obj = F2(‘alex‘)
obj.show()
obj.foo()

#以下为执行结果
F2.show
alex

 

继承的顺序

 

 如图继承方式

 

 

class C_2:
    def f2(self):
        print(‘C-2‘)

class C_1(C_2):
    def f2(self):
        print(‘C-1‘)

class C0(C_2):
    def f1(self):
        print(‘C0‘)

class C1(C0):

    def f1(self):
        print(‘C1‘)

class C2(C_1):
    def f2(self):
        print(‘C2‘)

class C3(C1,C2):
    def f3(self):
        pass

obj = C3()
obj.f2()

#以下为执行结果：
C2