Python&replace()方法

[DrCrypto]

令s="TTATGTTTTAAGGATGGGG"
s.replace(s[:2],'')
输出：'ATGAAGGATGGGG'
可是为什么少了4个T???

[李察德-泰森]

>>> help(s.replace)
Help on built-in function replace:

replace(...)
    S.replace(old, new[, count]) -> string
    
    Return a copy of string S with all occurrences of substring
    old replaced by new.  If the optional argument count is
    given, only the first count occurrences are replaced.

这是replace的说明，看了你就知道了

[zd357]

s.replace(s[:2],'') 不就是s.replace("TT" ,'')吗，把s里的TT都换成空，所以TT都没了。