Python String Methods

Question 1

Removes leading and trailing whitespace (or specified characters).

Answer 1

strip()

"  hello  ".strip()  # Output: "hello"

Question 2

Replaces a specified substring with another substring.

Answer 2

replace()

"hello world".replace("world", "Python")  # Output: "hello Python"

Question 3

Splits a string into a list based on a delimiter.

Answer 3

split()

"a,b,c".split(",")  # Output: ["a", "b", "c"]

Question 4

Joins elements of an iterable into a string using a specified separator.

Answer 4

join()

", ".join(["a", "b", "c"])  # Output: "a, b, c"

Question 5

Converts all characters in a string to lowercase.

Answer 5

lower()

"HELLO".lower()  # Output: "hello"

Question 6

Converts all characters in a string to uppercase.

Answer 6

upper()

"hello".upper()  # Output: "HELLO"

Question 7

Checks if a string starts with a specified substring.

Answer 7

startswith()

"hello".startswith("he")  # Output: True

Question 8

Checks if a string ends with a specified substring.

Answer 8

endswith()

"hello".endswith("lo")  # Output: True

Question 9

Checks if all characters in a string are digits.

Answer 9

isdigit()

"123".isdigit()  # Output: True

Question 10

Checks if all characters are alphanumeric (letters or numbers).

Answer 10

isalnum()

"abc123".isalnum()  # Output: True

Question 11

Checks if all characters in a string are whitespace.

Answer 11

isspace()

"   ".isspace()  # Output: True

Question 12

Formats a string using placeholders.

Answer 12

format()

"Hello, {}".format("Alice")  # Output: "Hello, Alice"

Question 13

Pads the string with zeros to make it a specified length.

Answer 13

zfill()

"5".zfill(3)  # Output: "005"

Question 14

Returns the first index of a specified substring or -1 if not found.

Answer 14

find()

"hello".find("e")  # Output: 1

Question 15

Returns the number of occurrences of a specified substring.

Answer 15

count()

"hello hello".count("hello")  # Output: 2