1.简单的打开文件
f=open('test.txt',encoding='utf-8') # 打开了名字为test.txt的文件里的内容 data=f.read() # 读取里面的内容 print(data)
f.close()
运行结果:
hello,word
Process finished with exit code 0
2.可读性
f=open('test.txt','r',encoding='utf-8') data=f.readable() # 是否可读 print(data) f.close()
运行结果:
True
Process finished with exit code 0
3.一行一行读取内容
f=open('test.txt','r',encoding='utf-8') print(f.readline(),end='') print(f.readline()) print(f.readline()) print(4,f.readline()) print(5,f.readline()) f.close()
运行结果:
1.hello,word 2.hello,word 3.hello,word 4 5 Process finished with exit code 0
4.读取全部内容
f=open('test.txt','r',encoding='utf-8') data=f.readlines() print(data) f.close()
运行结果:
['1.hello,word ', '2.hello,word ', '3.hello,word '] Process finished with exit code 0
5.写入操作 (只能是字符串类型)
1.
f=open('test.txt','w',encoding='utf-8') f.write('1111 ') # 想换行需要加 f.write('222') f.close()
打开test.txt文件就会看到写入的1111和222
2.写入列表
f=open('test.txt','w',encoding='utf-8') f.writelines(['456 ','123 ','asd ']) f.close()
可以打开自己的test.txt文件内容查看
3.追加
f=open('test.txt','a',encoding='utf-8') f.write(' 123')
4.
f1 = open('test.txt','r',encoding='utf-8') data = f1.readlines() f1.close() f2 = open('test_new.txt','w',encoding='utf-8') # 新建一个文件 f2.write(data[0]) # 删除除第一行外的其他行,并写入到新文件里 f2.close()
5.
with open('test.txt','w') as f: # 写入文件并自动关闭,不用手动close() f.write('123')
6.从一个文件里读取到 文件 然后写入到另一个文件
with open('test.txt','r',encoding='utf-8') as f, open('test_new.txt','w',encoding='utf-8') as f1: data = f.read() f1.write(data)