Python Revision - Section I - Data Types

Numbers

In Python we just have: integers and floating-point numbers.

Strings

• Immutability: Once a string is created, the elements within it can not be changed or replaced.

• Methods:

    s.upper()
    s.lower()
    s.split()
  

• Print Formatting:

    print("bla bla {}".format("ble ble"))
    #=> prints 'bla bla ble ble' to STDOUT.
  

  We can also write print formatting like this:

    text = "ble ble"
    print(f"bla bla {text}")
    #=> prints 'bla bla ble ble' to STDOUT.
  

Lists

• Methods:

    l.append()
    l.pop()
  

Dictionaries

• Methods:

    d.keys()
    d.values()
    d.items()
  

Tuples

• Immutability: Use tuples to present things that shouldn’t be changed, such as days of the week.

• Methods:

    t.index("value")
    t.count("value")
  

  • Tuples doesn’t have an append method.

Sets

• Unique elements: we can get a list of unique element calling the set function.

    set(list)
  

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I hope it will be helpful to you and if there’s any questions or something else, please, feel free to contact me.

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