利用python脚本删除txt文件每行后4个字符，并换行

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
\\	\