python操作文件常用写法
#P1 打开文件、读文件、关闭文件的典型方法try:
f=open('D:/test.txt','r')
print(f.read())
finally:
if f:
f.close()
#P2 推荐的简洁写法，不必显示的关闭文件描述符
#open返回的对象在python中称作file-like 对象，可以是字节流、网络流、自定义流等
with open('D:/test.txt','r') as f:
#按行读取
for line in f.readlines():
print(line.strip())
#P3 直接读取二级制的图片、视频文件
# with open('D:/banner.jpg','rb') as f2:
# for line in f2.readlines():
# print(line.strip())
#P4 可以指定编码读取相应的数据,还可以忽略非法编码
with open('D:/test.txt','r',encoding='gbk',errors='ignore') as f3:
for line in f3.readlines():
print(line.strip())
#P5 写文件的流程和读文件是一样的 代开文件、写入内容、关闭文件
# 'r' open for reading (default)
# 'w' open for writing, truncating the file first
# 'x' open for exclusive creation, failing if the file already exists
# 'a' open for writing, appending to the end of the file if it exists
# 'b' binary mode
# 't' text mode (default)
# '+' open a disk file for updating (reading and writing)
# 'U' universal newlines mode (deprecated)
with open('D:/test12.txt','a+') as f4:
for line in f4.readlines():
print(line.strip())
f4.write('a new line2!')
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