1.keyword
https://www.cnblogs.com/pachongshangdexuebi/p/7201983.html
Convert To Lowercase/Convert To Uppercase
用法：[ string ]，字符串中字符全转为小写/大写
Decode Bytes To String
用法：[ bytes | encoding | errors=strict ],使用给定的编码将给定字节解码为Unicode字符串。
Encode String To Bytes
用法：[ string | encoding | errors=strict ]
Fetch From Left/Fetch From Right
[ string | marker ]
Generate Random String
[ length=8 | chars=[LETTERS][NUMBERS] ]
Get Line
[ string | line_number ]
Get Line Count
[ string ]
Get Lines Containing String/Get Lines Matching Pattern
[ string | pattern | case_insensitive=False ]
Get Lines Matching Regexp
[ string | pattern | partial_match=False ]
Get Regexp Matches
[ string | pattern | *groups ]
Get Substring
[ string | start | end=None ]
Remove String
[ string | *removables ]
Remove String Using Regexp
[ string | *patterns ]
Replace String
[ string | search_for | replace_with | count=-1 ]
Replace String Using Regexp
[ string | pattern | replace_with | count=-1 ]
Should Be Byte String
[ item | msg=None ]
Should Be Lowercase
[ item | msg=None ]
Should Be String
Should Be Titlecase
Should Be Unicode String
Should Be Uppercase
Should Not Be String
Split String
Split String From Right
Split String To Characters
Split To Lines
Strip String