使用 python 中的 2 个变量对字符串进行切片的方法

Question

I m new to programming and came across a question If I have a string where I have 2 variables indexed.. and need the value from the middle.

for example, my string is HeyEveryoneImtryingtolearnpythonandihavequestion where I have variables

V1 = 'Imtrying'
V2 = 'andihave'

what can I do to get the "learnpython" substring? or is it not valid?

Answer 1

You can use index and slicing:

s = 'HeyEveryoneImtryingtolearnpythonandihavequestion'

v1 = 'Imtrying'
v2 = 'andihave'

start = s.index(v1) + len(v1)
end = s.index(v2, start)

output = s[start:end]
print(output) # tolearnpython

Answer 2

You can also use regex:

import re

s = "HeyEveryoneImtryingtolearnpythonandihavequestion"
V1 = 'Imtryingto'
V2 = 'andihave'

a = re.search(f"{re.escape(V1)}(.*?){re.escape(V2)}", s).group(1) # 'learnpython'