Case Sensitivity in Python

Задание 1

Given a string:

pythontxt = 'ABCDE'

Make all the letters in it lowercase.

Задание 2

Given a string:

pythontxt = 'abcde'

Capitalize all letters in this line.

Задание 3

Given a string:

pythontxt = 'abcde'

Capitalize the first letter of this line.

Задание 4

Given a string:

pythontxt = 'word1 word2 word3'

Capitalize the first letter of each word in this line:

python'Word1 Word2 Word3'

Задание 5

Given a string:

pythontxt = 'ABC def'

Change the case of the characters to the opposite:

python'abc DEF'

Задание 6

Given a list:

pythonlst = ['ab', 'Cd', 'eF']

Let each of its elements begin with a capital letter.

Задание 7

Suppose you have a dictionary where the keys are usernames and the values ​​are their emails. Write code so that all the letters in the email strings are lowercase.