# File: ChapterStrings/stringClear.py 
""" Python: L.find(x), L.count(x), L.replace('u', '')
0,1,1,0,0,0
 011000
0,1,1,0,0,0
 [1, 2]
count how many 1's: 2
find first position of 1: 2
remove all commas: 011000
"""
def myclear(S): #only 0 and 1
    clear = ''
    for c in S:
        if (c == '1' or c == '0'):
            clear = clear +  c
    return clear
    
def mylist1(S):  #list of indexes of 1
    res = []
    i = 0        #index
    for c in myclear(S):
        if ( c == '1'):
            res.append(i)
        i = i + 1
    return res
        
def main():
    S = '0,1,1,0,0,0\n' # s  string
    print(S,myclear(S))   # 011000
    print(S,mylist1(S))   # positions of 1:  [1,2]
    print("count how many 1's:",S.count('1'))      # 2
    print("find first position of 1:",S.find('1')) # 1
    print("remove all commas:",S.replace(',',''))  # 011000

main()