1. How to display single and double quotation marks in a string at the same time

print('hello "world"')
print("hello 'world'")
# Escape character
print('"hello" \'world\'')

hello "world"

hello 'world'

"hello" 'world'

2. There are several ways to invalidate escape characters in a string （r、repr and \）

print(r'Let \'s go!')

Let \'s go!

print('hello \nworld')
print(repr('hello \nworld'))

hello 

world

'hello \nworld'

print('hello \\nworld')

hello \nworld

3. How to preserve the original format of a string

print('''
hello
world
''')

 hello

 world

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