Python Challenge Second question string substitution

Question 1th string substitution

Push the letters in the string backwards by two, for example A to C,z to B and the other characters unchanged.

1 defconvert_string (astring):2bstring =' '3          forIinchastring:4             ifOrd'a') <=ord (i) <=ord ('W')orOrd'A') <=ord (i) <=ord ('W'):5k = Chr (ord (i) +2)6             elifi = ='y' ori = ='Z':7k = Chr (Ord ('a') +1+ord (i)-ord ('Z'))8             elifi = ='Y' ori = ='Z':9k = Chr (Ord ('A') +1+ord (i)-ord ('Z'))Ten             Else: OneK =I ABstring + =k -         returnBstring

Effect:

Official recommended method for Maketrans

" abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz "  "cdefghijklmnopqrstuvwxyzabcdefgfijklmnopqrstuvwxyzab"=  Thestring.translate (Thestring.maketrans (intab,outtab))

Maketrans returns the conversion list, which converts the character in the string Intab to the character in the corresponding position in the Outtab, and translate performs the conversion operation on the converted list returned by Maketrans.

Question 2nd finding characters from a string

View the Web page source code and save that heap of characters in a file rare_char.txt text file.

File = open ("/home/zhanchao/desktop/rare_char.txt"= file.read ()   for in filestr:        if"a"<=i<="  z":                print(i)

Python Challenge Second question string substitution