不覆盖输入：
1 with open(‘1.txt‘,‘rt‘)as f: 2 data=f.read() 3 print(data+"\n")
读取txt:
1 with open(‘1.txt‘,‘at‘)as f: 2 f.write(‘\n111111‘)
Python 不覆盖输入txt 读取txt
原文：https://www.cnblogs.com/smartisn/p/11734660.html
