利用python脚本删除txt文件每行后4个字符，并换行
# import os
filename = r"123.txt"
new_filename = r"1234.txt"
with open(filename,encoding="utf-8") as f1, open(new_filename,"w",encoding="utf-8") as f2:
for line in f1:
new_line = line[:-4]
f2.write(new_line)
f2.write('\n')
f1.close()
f2.close()
# import os
filename = r"123.txt"
new_filename = r"12345.txt"
with open(filename,encoding="utf-8") as f1, open(new_filename,"w",encoding="utf-8") as f2:
for line in f1:
new_line = line[3:]
f2.write(new_line)
f1.close()
f2.close()
有时我们并不想让转义字符生效，我们只想显示字符串原来的意思，这就要用r和R来定义原始字符串。如：print r'\t\r'
实际输出为“\t\r”。
常见的转义字符
| 转义字符 | 输出 |
| \' | ' |
| \" | " |
| \a | ‘bi’响一声 |
| \b | 退格 |
| \f | 换页(在打印时) |
| \n | 回车，光标在下一行 |
| \r | 换行，光标在上一行 |
| \t | 八个空格 |
| \\ | \ |
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