How to use 'python remove end of string' in Python

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def remove_str_part(istr,start_mark, end_mark):
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    start = istr.find(start_mark)
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    end = istr.find(end_mark)
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    if start != -1 and end != -1:
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        remove_part = istr[start:end+1]
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        istr = istr.replace(remove_part,'')
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    return istr

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def remove(s):
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    i = 0
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    j = 0
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    while i < len(s):
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        if s[i] == 0:
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            i+=1
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        else:
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            s[j] = s[i]
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            i+=1
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            j+=1
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    while j < len(s):
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        s[j] = 0
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        j+=1
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    return s