A cheatsheet for string processing in Python. 

How to convert a text with percentages to float

Use strip('+%'):

txt = "+77%"


 Regular expressions in re.search

Check if a string contains any letter:
re.search('[a-zA-Z]', the_string)

Check if a string contains all — uppercase, lowercase, and numbers:
upcase = re.search(r"[A-Z]", the_string)
lowcase = re.search(r"[a-z]", the_string) nums = re.search(r"[0-9]", the_string) contains_all = all((upcase, lowcase, nums))