Python Projects for Beginners a ten-Week Bootcamp Approach to Python Programming

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Python Projects for Beginners A Ten Week Bootcamp Approach to Python

Bu sahifa navigatsiya:

• Problem-Solving
• Wednesday: Tuples, Sets, Frozensets
• Tuples, Sets, Frozensets. ” What Are Tuples A tuple

TUESDAY EXERCISES

1.	User Input: Declare an empty dictionary. ask the user for their name, address, and number. add that information to the dictionary and iterate over it to show the user.
2.	Problem-Solving: What is wrong with the following code: >>> person = { 'name', 'John Smith' } >>> print(person['name'])

Today was important in understanding how to work with dictionaries. remember that adding and altering key-value pairs are the same syntax.
Wednesday: Tuples, Sets, Frozensets
Python includes several other data collections that all have their own features. Today, we’ll look at another three that can be useful at times.
To follow along with this lesson, let’s continue from our notebook file “Week_06” and simply add a markdown cell at the bottom that says, “Tuples, Sets, Frozensets.”
What Are Tuples?
A tuple is identical to a list, except it is immutable. When something is immutable, it means that it cannot be altered once declared. Tuples are useful for storing information that you don’t want to change. They’re ordered like lists, so you can iterate through them using an index.

Declaring a Tuple

To declare a tuple, you use a comma to separate two or more items. Lists are denoted by their square brackets on the outside, whereas tuples can be declared with optional parenthesis. It’s more likely they’re declared with parenthesis as it’s easier to read. Let’s see an example:

# declaring a tuple
t1 = ("hello", 2, "hello") # with parens t2 = True, 1 # without parens print( type(t1), type(t2) ) # both are tuples t1[0] = 1 # will crash, tuples are immutable once declared

Go ahead and run the cell. You can see that we output the types of our variables, which both output “tuple”. As stated, tuples are declared with and without parenthesis. The last line in this cell will create an error because a tuple’s items cannot be altered once declared. The only way to overwrite the data within a tuple is to re-declare the entire tuple.

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