Error in python search function -

i getting trying build search function searches through text files , prints search string if string found in text file. if users second string (quotesearch2) empty first string searched , printed (quotesearch1). why keep getting 2 syntax error messages lines 16 , line 23 (the code checker stoped after line 105 there may more after point).excuse code, beginner, not want alternative code complete function, want errors resolved.

the error is:

syntaxerror: invalid syntax

def search():     import os.path     print "you chose search option"     validchars = "-.() %s%s" %(string.ascii_letters , string.digits)     thisdir = raw_input("what directory search ? not: invalid characters stripped ") #ask user choose directory multi os compatibility      thisdir = ''.join(y y in filesearch if y in validchars)     filesearch = raw_input("what file search ? note: invalid characters stripped: ") #ask user file t search      filesearch = ''.join(x x in filesearch if x in validchars)     fullpath = os.path.join(thisdir, filesearch) #create full path operating system compatibility      while os.path.isfile(fullpath) == false: #check if file doesnt exist, if doesnt alert user         print "sorry file chose not exist"           thisdir = pickafolder         filesearch = raw_input("what file search ? note: invalid characters stripped: ")         filesearch = ''.join(x x in filesearch if x in validchars) #strip invalid characters             fullpath = os.path.join(thisdir, filesearch)     elif os.path.isfile(fullpath) == true:         f = open(fullpath, 'r') #open file          found = false         linecount = 0         while found == false: # while found variable equal false ask user search              quotesearch1 = raw_input("whats first string search ?: ")             quotesearch2 = raw_input("whats second string want search ?: "             line in f: #for each line in quote file if quotesearch1 (usersfirst search) in line, print along blank line                 if quotesearch2 != " " or "":                     if quotesearch1 , quotesearch2 in line:                         print line                         print "\n"                         linecount = line + 1  # variable track amount of lines printed                 elif quotesearch2 == " " or "":                          if quotesearch1 in line:                         print line                         print "\n"                         linecount = line + 1                 found = true             if linecount == 0 , found == true : # if variable == 0 quote search not in file , if search completed                 print "sorry search not found" # print quote search cold not found                 menu = true                 fclose(fullpath)         elif found == true:             print "search complete" 

while os.path.isfile(fullpath) == false:   elif os.path.isfile(fullpath) == true: 

you use capital f false in python , capital t true

and missing closing ")" on line quotesearch2 = raw_input("whats second string want search ?: "

if quotesearch2 != " " or "": 

should if quotesearch2 != " " or quotesearch2 != "":

 elif quotesearch2 == " " or "":  

should elif quotesearch2 == " " or quotesearch2 == "":

you not checking if quotesearch2 not equal ""

in [7]: i=10   in [8]: if   == 9 or 4:             print "weird"    ...:             weird  in [9]: if   == 9 or == 4:         print "weird"    ...:       in [10]: 

you see print "weird" gets executed though i not equal 10 in second statement when use or == 4: not.