- 掌握基于python对文件相关操作
- 每种格式包含很多相关操作,学习只要掌握知识点的用法,参考笔记可以实现相关的练习即可,不必背会,在企业开发过程中边搜实现。
学习内容
- 了解python函数和模块
- 文件操作:读文件,写文件
- 文件夹和路径
- csv格式文件
- ini格式文件
- xml格式文件
- excel文件
- 压缩文件
第1节 了解函数和模块 1.1函数的定义
- 定义了一个功能模块,调用函数。
- 对公共代码块进行封装,实现代码可重用。
- 内置函数len计算长度,
- 内置函数进制之间的转换,bin,oct,hex
- 自定义函数。
def print_name(names):
name = "你好"
data = len(names)
print(data)
# 按间距中的绿色按钮以运行脚本。
if __name__ == '__main__':
print_name('data')
1.4什么是模块
- 内置模块,python内部提供的。
- 第三方模块,网上下载别人写好的模块(功能集合)
- 自定义模块,自己写的。
第2节 数据类型 2.1字符串 str
- 字符串str,用来表示文本和文字信息,本质上是unincode编码中的二进制。
name = "字符串类型" print(name) 输出结果:字符串类型2.2 字节类型 bytes
- 字节类型bytes,可表示文字信息,本质上是utf-8/gbk等编码的二进制,对unicode进行压缩,方便存储文件和网络传输。
- 可表示原始二进制(图片,文件)等信息。
- 比如给了一个字符串,通过字符串调用encode(),可以将字符串转换成utf-8的字节类型,打印输出字节,字节可以输出文本信息。
name = "字节类型"
data = name.encode('utf-8')
print(data)
输出结果:b'xe5xadx97xe8x8ax82xe7xb1xbbxe5x9ex8b'
- 字节类型的字符串可以通过调用decode()再次转换成字符串类型,得到的是字符串。
result = data.decode('utf-8')
print(result)
输出结果:字节类型
第3节 读文件操作 3.1 打开文件
- 如果想打开一个文件,首先需要python提供的内置函数open(),利用它打开文件。
- 打开的时候,需要传递第一个值叫路径:这个路径可以是相对路径或者绝对路径。
- 绝对路径:D:xmlinfo.txt
- 相对路径:info.txt
- 第二个需要传递的是模式:rb表示读取文件原始的二进制(r:读read,b:二进制binary)
- 比如说这个文件是以gbk的文件编码存储的,那就是以gbk的格式存储在硬盘上,rb说明读到的二进制是原来存进去的gbk。
file_object = open('info.txt', mode='rb')
3.2 读取文件
file_object对象调用read()方法,可以把文件的内容全部读取出来。读取之后赋值给data。
data = file_object.read()3.3 关闭文件
最后关闭文件,输出结果。
file_object.close() print(data)3.4读文本文件
# 读文本文件步骤
# 1.打开文件
file_object = open('info.txt', mode='rb')
# 2.读取文件
data = file_object.read()
# 3.关闭文件
file_object.close()
print(data)
输出结果:
b'CONSTANT_RANGE'
3.5 读图片等非文本内容文件
# 读文件图片步骤
# 1.打开文件图片
file_object = open('1.png', mode='rb')
# 2.读取文件图片
data = file_object.read()
# 3.关闭文件图片
file_object.close()
print(data)
输出结果:
b'x89PNGrnx1anx00x00x00rIHDRx00x00x01x0cx00x00x00xd6x08x06x00x00x00$^xbcnx00x00x00tpHYsx00x00x0exc4x00x00x0exc4x01x95+x0ex1bx00x00x04xeeiTXtXML:com.adobe.xmpx00x00x00x00x00 6xc6-Sx00x00EXIDATxx9cxedx9dwxTxc5xf7x87xdfxbb=xbdx91x04x12Bx02x81x00x91xdex9bx80x80x80 xa0x82xd2x04x14x15x04xa4Ix16xe4x07*xc5x06xa1Ex04+xfaxc5x82xd8xc5x8e("Exaa 5tx08xa1'x84xf4xbe;xbf?xb6x90@x02txd9xecnx92xfb>xcfxdcxd5xd2xcd1_gdxc1xfdx01x01x01xbd-uxd4xae][x9c}|-xfbx9b7o.bccxc5xf1xe3xc7x85xbbxbbxbbxf5XWWxd7[xae_xabVxadNx8exbe_rqxd0xf7xd4xd1x06xc8Exd0xa6Mx9bxdafx9fx84xd8xbbwxafxe8xddxbbxb7xf5xe1xacWxafx9ex88x8fx8fx17x17/^x14xf7xde{xafxc5xaf 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