Python join、center

1.join:

对元素用指定字符串分割并拼接成新的字符串

seq = {'hello': 1, 'good': 2, 'boy': 3, 'do': 4}

print(':'.join(seq))

======hello:good:boy:do======

2.str.center(10，'-'):

对原字符串进行满10位的从中心向两边的扩充，原字符串不够10位，用'-'进行补充

name = 'egon'print(name.center(10, "-"))

---egon---

print(name.ljust(10,"#"))

egon######

print(name.zfill(20))

0000000000000000egon