Question

How to move all special characters to the beginning of a string in Python

Answer 1

def move_special_characters_to_beginning(s):  
 
    length = len(s) 
   
    chars, pecial_characters = "", ""  
    for i in range(0, length):  
        ch = s[i]  
        if ch.isalnum() or ch == " ":  
            chars = chars + ch  
        else: 
            pecial_characters = pecial_characters + ch  
           
    return pecial_characters + chars
       
      
s = "c++£$vb.net&%java*() php <>/python 3.7.3"
       
print(move_special_characters_to_beginning(s))  
 
 
'''
run:
 
++£$.&%*()<>/..cvbnetjava php python 373
 
'''

 

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Answer 2

def move_special_characters_to_beginning(s: str) -> str:
    specials = ""
    chars = ""
    
    for ch in s:
        if ch.isalnum() or ch.isspace():
            chars += ch
        else:
            specials += ch
    
    return specials + chars


s = "c++20$c&^java*(rust) php <>/python 3.14.2"

print(move_special_characters_to_beginning(s))



'''
run:

++$&^*()<>/..c20cjavarust php python 3142

'''

 

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