Strings

def removeLetters(string):
#@param:
#   string: string;
#   return: string;
    s = ""
    for i in string:
        if not i.isalpha():
            s = s + i
    return s

def removeLetters1(string):
#@param:
#   string: string;
#   return: string;
    s = ""
    i = 0
    while i < len(string):
        if not string[i].isalpha():
            s = s+string[i]
        i = i+1
    return s
#-------------------------------------------------------------------------------
def removeNumbers(string):
#@param:
#   string: string;
#   return: string;
    s = ""
    for i in string:
        if not i.isdigit():
            s = s + i
    return s

def removeNumbers1(string):
#@param:
#   string: string;
#   return: string;
    s = ""
    i = 0
    while i < len(string):
        if not string[i].isdigit():
            s = s+string[i]
        i = i+1
    return s
#-------------------------------------------------------------------------------
def findString(string,find,start=0,end=len(string)):
#@param:
#   string: string;
#   find: string;
#   start, end: int;
#   return: int;
    if len(string)<len(find):
        return -1
    i = start
    lenght = len(find)
    while i<end:
        s = string[i:i+lenght]
        if find == s:
            return i
        i = i+1
    return -1

def rFindString(string,find):
#@param:
#   string: string;
#   find: string;
#   start, end: int;
#   return: int;
    if len(string)<len(find):
        return -1
    i = len(string)
    lenght = len(find)
    while i>0:
        s = string[i-lenght:i]
        if find == s:
            return i-1
        i = i-1
    return -1
#-------------------------------------------------------------------------------
def changeRepetitiveCharacter(string):
#@param:
#   string: string;
#   return: string;
    s = string
    for i in range(0,len(string)):
        a = s[i]
        if a!="*" and a!=" ":
            s = s[:i+1] + s[s.find(s[i])+1:].replace(s[i],"*")
    return s
#-------------------------------------------------------------------------------
def palindrome(string):
#@param:
#   string: string;
#   return: bool;
    lenght = len(string)
    for i in range(0,-1+lenght/2):
        if string[i] != string[lenght-1-i]:
            return False
    return True
#-------------------------------------------------------------------------------
def findSequence(filePath,sequence):
#@param:
#   filePath: string;
#   sequence: string
    file = open(filePath,"rt")
    f = file.read()
    s = f.find(sequence)
    start = f[:s].rfind(">")
    end = start + f[start:].find("\n")
    name = f[start:end]
    print "found in",name