String concatenation and repetition in Python - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is string concatenation?

String concatenation is joining two or more strings together to make one longer string.

beginner

How do you concatenate strings in Python?

Use the + operator to join strings. For example, 'Hello' + ' ' + 'World' results in 'Hello World'.

beginner

What does string repetition mean?

String repetition means repeating the same string multiple times in a row.

beginner

How do you repeat a string in Python?

Use the * operator with an integer. For example, 'ha' * 3 results in 'hahaha'.

intermediate

What is the output of this code: 'Hi' + '!' * 3?

The output is 'Hi!!!' because '!' is repeated 3 times and then concatenated with 'Hi'.

Which operator is used to join two strings in Python?

A /

B *

C -

D +

The + operator joins (concatenates) two strings.

What does 'abc' * 2 produce?

A 'abcabc'

B 'abc2'

C 'abc abc'

D 'aabbcc'

The * operator repeats the string twice, so 'abcabc'.

What is the result of 'Hello' + ' ' + 'World'?

A 'HelloWorld'

B 'Hello World'

C 'Hello World'

D 'Hello+World'

The strings are joined with a space in between, resulting in 'Hello World'.

Which of these is NOT a valid way to concatenate strings in Python?

A 'a' + 'b'

B 'a' * 3

C 'a' - 'b'

D 'a'.join(['b', 'c'])

The - operator cannot be used with strings.

What will '!' * 0 return?

A '' (empty string)

B '!'

C Error

D '0'

Repeating a string zero times returns an empty string.

Explain how to join two strings and repeat a string in Python with examples.

Think about using + to add strings and * to repeat them.

What happens if you multiply a string by zero or a negative number in Python?

Consider how repetition count affects the output.