python基础（四）——读写文件

#_*_ coding: utf-8 _*_
#写文件，先以w的格式打开文件（w即write，写），再writelines()写文件
f = open("c:/Users/47864/Desktop/2.txt", "w")
f.writelines("read success\n" + "lkzlso")
f.close()
print("write success!")
#读文件，直接open文件，再readlines()
f = open("c:/Users/47864/Desktop/2.txt")
while True:
    content = f.readlines()
    if not content:
        break
    for line in content:
        print(line.strip())
#以a的格式打开文件（a即append，追加），再追加进文件
f = open("c:/Users/47864/Desktop/2.txt", "a")
f.write("\nappend\n")
f.close()
#读文件
f = open("c:/Users/47864/Desktop/2.txt")
while True:
    content = f.readlines()
    if not content:
        break
    for line in content:
        print(line.strip()) 

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输出结果：

write success!
read success
lkzlso
read success
lkzlso
append