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For Loops in Python
Python's for loop is a powerful tool that allows you to iterate over a sequence of values. In this tutorial, we will learn how to use the for loop to traverse over a list, a tuple, a set, and a dictionary.
The basic syntax of the for loop is:
for element in sequence:
# do something with element
The sequence can be a list, a tuple, a set, or a dictionary. The element represents each of the items in the sequence. For example, if you had a list of numbers, the element would be each of the numbers in the list.
Let's take a look at how to use the for loop to traverse a list. We will create a list of numbers and then use the for loop to print out each element in the list.
# create a list of numbers
number_list = [1, 2, 3, 4, 5]
# use a for loop to print each element in the list
for num in number_list:
print(num)
The output of this code will be:
1
2
3
4
5
We can also use the for loop to traverse a tuple, a set, and a dictionary. Let's take a look at an example of each.
First, let's look at a tuple. We will create a tuple of strings and then use the for loop to print out each element in the tuple.
# create a tuple of strings
string_tuple = ('Hello', 'World', 'Welcome', 'To', 'Python')
# use a for loop to print each element in the tuple
for string in string_tuple:
print(string)
The output of this code will be:
Hello
World
Welcome
To
Python
Next, let's look at a set. We will create a set of numbers and then use the for loop to print out each element in the set.
# create a set of numbers
number_set = {1, 2, 3, 4, 5}
# use a for loop to print each element in the set
for num in number_set:
print(num)
The output of this code will be:
1
2
3
4
5
Finally, let's look at a dictionary. We will create a dictionary of numbers and then use the for loop to print out each key-value pair in the dictionary.
# create a dictionary of numbers
number_dict = {'one': 1, 'two': 2, 'three': 3, 'four': 4, 'five': 5}
# use a for loop to print each key-value pair in the dictionary
for key, value in number_dict.items():
print(key, value)
The output of this code will be:
one 1
two 2
three 3
four 4
five 5
As you can see, the for loop is a powerful tool that can be used to traverse over a sequence of values. It can be used to traverse over a list, a tuple, a set, and a dictionary.