Python For GCSE
Handling Strings

Strings Are Lists Of Characters

Strings are lists of character data. We can use the index of these characters to access parts of a string separately.

name = "Ozymandias"

for i in range(len(name)):

We can loop through a string without using a counting loop.

name = "Ozymandias"

for n in name:


The keyword in allows us to check if a string contains another string - or not.

name = "Ozymandias"

if "man" in name:
    print("Contains man.")

if  "chips" not in name:
    print("Does not contain chips")

Case Conversion

We can change the case of a string,

name = "Ozymandias"

low = name.lower()
up = name.upper()


ASCII Numbers

We can turn ASCII numbers into characters using the chr() function and get the ASCII number of a character using the ord() function.

for i in range(65,70):
    c = chr(i)

for c in "abcde":
    asc = ord(c)

Other Useful String Methods

The following all assume a string defined using the variable name txt.

capitalize()The string with the first letter converted to upper case.t = txt.capitalize()
center()The string centred. t =
t =,"*")
endswith()True or false.tion= txt.endswith("tion")
find()The index of a substring of a string or -1 if not found.i = txt.find("dis")
isalnum()True if all characters in the string are alphanumeric.alphanum = txt.isalnum()
isalpha()True if all characters in the string are letters.alpha = txt.isalpha()
isdigit()True if all characters in the string are digits.dig = txt.isdigit()
islower()True if all characters in the string are lower case.low = txt.islower()
isupper()True if all characters in the string are upper case.up = txt.isupper()
join()Joins the elements of a list into a single string using the given separator.s = ",".join(mylist)
lstrip()Removes spaces from the left side of a string.t = txt.lstrip()
replace()Replaces part of a string with a specified string.t = txt.replace("him", "her")
rstrip()Removes spaces from the right side of a string.t.txt.rstrip()
split()Splits a string into a list using a specified separator.mylist = txt.split(",")
startswith()True or false.tion= txt.startswith("re")
strip()Removes whitespace from the beginning and end of a string.t = txt.strip()
title()The string converted to title case.t=txt.title()