python文件操作的几种方法：

读：r,rb,r+,r+b

写:w,wb,w+,w+b

加:a,ab,a+,a+b

tell():获取光标的位置

seek:调整光标的位置

flush:强制刷新

“”"

f = open(“中国.txt”,encoding = “utf-8”,mode = “r”)

content = f.read()

print(content)

f.close()

read(n)按照字符去读

f = open(“中国.txt”,encoding = “utf-8”,mode = “r”)

content = f.read(4)

print(content)

f.close()

readline()一行一行读

f = open(“中国.txt”,encoding = “utf-8”,mode = “r”)

content = f.readline()

print(content)

f.close()

readlines()返回一个列表，列表的每个元素就是每行

f = open(“中国.txt”,encoding = “utf-8”,mode = “r”)

content = f.readlines()

print(content)

f.close()

for读取

f = open(“中国.txt”,encoding = “utf-8”,mode = “r”)

for line in f:

print(line)

f.close(

#rb操作非文本的文件

f = open(“1.jpg”, mode=“rb”)

c = f.read()

f.close()

f1 = open(“2.jpg”, mode=“wb”)

f1.write©

f1.close()

w 文件的读 如果文件存在先清空原内容，再写入新内容

f = open(“小人本.txt”,encoding = “utf-8”,mode = “w”)

f.write(“垃圾日本”)

f.close()

wb操作非文本

f = open(“1.jpg”, mode=“rb”)

c = f.read()

f.close()

f1 = open(“2.jpg”, mode=“wb”)

f1.write©

f1.close()

文件的追加a,ab,a+,a+b,没有文件，创建文件，追加内容，有文件在源文件的最后面加入内容

f = open(“荷花.txt”,encoding = “utf-8”,mode = “a”)

f.write(’\n大农送’)

f.close()

文件的读写r+,必须先读再加，顺寻不能错误

f = open(“中国.txt”,encoding = “utf-8”,mode = “r+”)

content = f.read()

print(content)

f.write("\n我爱中国1111")

f.close()

tell()获取光标的位置，先读再获取，单位：字节

f = open(“中国.txt”,encoding = “utf-8”,mode = “r+”)

print(f.tell())

content = f.read()

print(f.tell())

f.close()

seek调整光标的位置,tell获取光标的位置

f = open(“中国.txt”,encoding = “utf-8”,mode = “r+”)

f.seek(6)

content = f.read()

print(content)

print(f.seek(60))

print(f.tell())

f.close()

flush强制刷新

f = open(“中国.txt”,encoding = “utf-8”,mode = “r+”)

f.write(“adas”)

f.flush()

f.close()

with open不需要关闭文件，open需要否则会一直占用内存

with open (“中国.txt”,encoding = “utf-8”) as f :

print(f.read())

with open (“中国.txt”,encoding = “utf-8”) as f,

open (“荷花”,encoding = “utf-8”,mode = “w”) as f1:

print(f.read())

f1.write(“荷花真漂亮”)

import os

with open (“中国.txt”,encoding = “utf-8”,mode = “r”) as f,

open (“我爱中国.txt”,encoding = “utf-8”,mode = “w”) as f1:

content = f.read()

content1 = content.replace(“中国”,“美女”)

f1.write(content)

os.remove(“中国.txt”)

os.renames(“我爱中国.txt”,“中国.txt”)

import os

with open (“中国.txt”,encoding = “utf-8”,mode = “r+”) as f:

content = f.read()

content1 = content.replace(“中国”,“美女”)

f.write(content1)

print(content1)

import os

with open (“中国.txt”,encoding = “utf-8”,mode = “r”) as f,

open (“我爱中国.txt”,encoding = “utf-8”,mode = “w”) as f1:

for line in f:

new_line = line.replace(“美女”,“中国”)

f1.write(new_line)

os.remove(“中国.txt”)

os.renames(“我爱中国.txt”,“中国.txt”)

有关清空的内容

关闭文件，再次以w模式打开此文件时，才会清空原有内容

with open (“中国.txt”,encoding = “utf-8”,mode = “w”) as f:

for i in range(10):

f.write(“阿松大”)

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Python技能树基础语法常用内置函数21660 人正在系统学习中

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原文链接：https://blog.csdn.net/Python_allthing/article/details/122724919