human
Solve the following python programming problem given the following code:
@ classmethod 
def _from_pip_string_unsafe(klass, version_string) : 
    if (not version_string [: 1].isdigit ()) : 
        raise ValueError (('Invalid version %r' % version_string)) 
input_components = version_string.split ('.') 
    components = [c for c in input_components if c.isdigit ()] 
    digit_len = len (components) 
    if (digit_len == 0) : 
        raise ValueError (('Invalid version %r' % version_string)) 
else : 
        if (digit_len < 3) : 
            if ((digit_len < len (input_components)) and input_components [digit_len] [0].isdigit ()) : 
                mixed_component = input_components [digit_len] 
                last_component = ''.join (itertools.takewhile ((lambda x : x.isdigit ()), mixed_component)) 
                components.append (last_component) 
                input_components [digit_len : (digit_len + 1)] = [last_component, mixed_component [len (last_component) :]] 
                digit_len += 1 
components.extend (([0] * (3 - digit_len))) 
components.extend (input_components [digit_len :]) 
    major = int (components [0]) 
    minor = int (components [1]) 
    dev_count = None 
    post_count = None 
    prerelease_type = None 
    prerelease = None 
    def _parse_type(segment) : 
        isdigit = operator.methodcaller ('isdigit') 
        segment = ''.join (itertools.dropwhile (isdigit, segment)) 
        isalpha = operator.methodcaller ('isalpha') 
        prerelease_type = ''.join (itertools.takewhile (isalpha, segment)) 
        prerelease = segment [len (prerelease_type) :] 
        return (prerelease_type, int (prerelease)) 
if _is_int (components [2]) : 
        patch = int (components [2]) 
else : 
        patch = 0 
        components [2 : 2] = [0] 
remainder = post_count [3 :] 
    remainder_starts_with_int = False 
    try : 
        if (remainder and int (remainder [0])) : 
            remainder_starts_with_int = True 
except ValueError : 
        pass 
if remainder_starts_with_int : 
        dev_count = int (remainder [0]) 
else : 
        if...

    
    

    Fix the buggy line: remainder = post_count [3 :]
assistant
#Here is Python code to fix the buggy line: remainder = post_count [3 :]
.

remainder = components [3 :]