log=open('1234txt','r')
log_read=log.readlines()
 
x=""
for a in log_read:
    if (a=='you love me'):
        x="True"

log=open('1234txt','r')
log_read=log.readlines()
 
x="you love me"
if x in log_read:
    return True

 
my_file = open('1234.txt','r')
whole_file = my_file.read()
my_file.close()
 
x = 'you love me'
 
 
def find_x_in_string(x,whole_file)
    index = 0
    end = len(x) - 1
    return_list = []
    while 1:
        try:
            my_str = whole_file[index:end]
            if my_str == x:
                return_list.append(my_str)
            index += 1
            end += 1
        except IndexError:
            break
    return return_list
 
return_list = find_x_in_string(x,whole_file)