import re
import string

def to_camel_case(name):
    return "".join([
        filter(
            lambda c : c not in string.punctuation + string.whitespace, part
        ).capitalize()
        for part in name.split("_")
    ])

def initials(name, sep_values = [" ", "_"]):
    return "".join([
        (s[0] if s else "") 
        for s in re.split("|".join(sep_values), name)
    ])

def camel_case_initials(name):
    return filter(lambda c : c.isupper(), name)

def complex_string(complex_num):
    return filter(lambda c : c not in "()", str(complex_num))