with open('c.txt',mode='at',encoding='utf-8') as f: print(f.readable()) print(f.writable()) f.read()
f.write('虎老师:123
')
在文件打开不关闭的情况下,连续的写入,下一次写入一定是基于上一次写入指针的位置而继续的 with open('d.txt',mode='wt',encoding='utf-8') as f: f.write('虎老师1:123
') f.write('虎老师2:123
') f.write('虎老师3:123
')
with open('d.txt',mode='wt',encoding='utf-8') as f: f.write('虎老师4:123
')
with open('d.txt',mode='at',encoding='utf-8') as f: f.write('虎老师1:123
') f.write('虎老师2:123
') f.write('虎老师3:123
') with open('d.txt',mode='at',encoding='utf-8') as f: f.write('虎老师4:123
')