Strings

Question 1

Convert string to uppercase

Answer 1

str.upper()

Question 2

Convert string to lower case

Answer 2

str.lower()

Question 3

Check string contains substring

Answer 3

‘substring’ in str

Question 4

Length of string

Answer 4

len(str)

Question 5

Replace substring with new substring

Answer 5

str.replace(‘old’, ‘new’)

Question 6

Split string into list

Answer 6

str.split(separator)

Question 7

Convert string to list

Answer 7

list(str)

Question 8

Extract substring from string

Answer 8

str[start:end]
Start inclusive, end exclusive

Question 9

Remove leading and trailing white spaces

Answer 9

str.strip()

Question 10

Check if string starts or ends with substring

Answer 10

str.startswith(‘Hello’)
str.endswith(‘World’)

Question 11

Split string around separator

Answer 11

str.partition(‘separator’)

Question 12

Add 0s on the left of string

Answer 12

str.zfill(5)
Makes string length 5, adding 0s to make it to 5

Question 13

Reverse string

Answer 13

str[::-1]

Question 14

Count frequency of characters in string

Answer 14

from collections import Counter

Counter(string)