Python For GCSE
Handling Strings

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)):
    print(name[i])

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

name = "Ozymandias"

for n in name:
    print(n)

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")

We can change the case of a string,

name = "Ozymandias"

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

print(low,up)

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)
    print(c)

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

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

Function	Returns	Example
capitalize()	The string with the first letter converted to upper case.	t = txt.capitalize()
center()	The string centred.	t = txt.center(10) t = txt.center(10,"*")
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()

MultiWingSpan