def InStr(data='', *strs):
    """
    Es-Valida si un string esta dentros de una lista de string
    
    En-Validate if a string is inside a string list
    
    test:

    >>> InStr("a","a","b","c")
    True
    >>> InStr("a","b","c")
    False
    """
    if len(strs) <= 0:
        return False
    for item in strs:
        if data == item:
            return True
    return False
