Python学习笔记 DAY12-优快云博客

截取

tip:

删除指定前缀/后缀

removeprefix

removesuffix

拆分和拼接

三分组

partition(sep)从左到右找分隔符

rpartition(sep)由右到左去找分隔符

split(sep=None,maxsplit=-1)

rsplit(sep=None,maxsplit=-1)

splitline(keepends)可识别不同书写形式的换行符，True是否带换行符

join(iterable)

格式化

format()方法3.6版本以下都可使用

f方法要3.6以上版本

"{:+} {:-}".format(520, -250)
'+520 -250'
"{:+} {:-}".format(520, 250)
'+520 250'
"{:,}".format(1234)
'1,234'
"{:-}".format(1234)
'1234'
"{:-}".format(1234)
'1234'
"{:,}".format(123456789)
'123,456,789'
"{:2f}".format(3.14159)
'3.141590'
"{:.2f}".format(3.14159)
'3.14'
"{:.2g}".format(3.14159)
'3.1'
"{:.6}".format("i love fish")
'i love'
"{:.2}".format("520")
'52'
"{:.2}".format(520)
Traceback (most recent call last):
  File "<pyshell#22>", line 1, in <module>
    "{:.2}".format(520)
ValueError: Precision not allowed in integer format specifier

f"{520:010}"
'0000000520'
f"3.14159:.2f"
'3.14159:.2f'
f"{3.14159:.2f}"
'3.14'