利用python腳本刪除txt文件每行後4個字符，並換行

利用python腳本刪除txt文件每行後4個字符，並換行

# 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()

有時我們並不想讓轉義字符生效，我們只想顯示字符串原來的意思，這就要用r和R來定義原始字符串。如：print r'\t\r'

　　實際輸出爲“\t\r”。

常見的轉義字符

轉義字符	輸出
\'	'
\"	"
\a	‘bi’響一聲
\b	退格
\f	換頁（在打印時）
\n	回車，光標在下一行
\r	換行，光標在上一行
\t	八個空格
\\	\