python - 在 Python 中添加一个字符串

Question

如果列表中的数字不是必需的位数，我会尝试在每个数字前加上零。

    lst = ['1234','2345']
    for x in lst:
        while len(x) < 5:
            x = '0' + x
    print(lst)

理想情况下，这将打印 ['012345', '02345']

Answer 1

您可以使用 zfill :

Pad a numeric string s on the left with zero digits until the given width is reached

lst = ['1234','2345']
[s.zfill(5) for s in lst]
# ['01234', '02345']

或者使用format具有填充和对齐的方法:

["{:0>5}".format(s) for s in lst]
# ['01234', '02345']