In this tutorial we are going to learn :
- For Loops
- Iterables
- The range () Function
- Nested Loops
For Loop
We use loops for iterating over a sequence ( string, list, tuple, dictionary, set ) or any
other iterable objects
Iterables
Examples of iterating lists and strings.
Iterating a List
Example :
Example of iterating a list.
# for loops
my_list = [1, 2, 3, 4, 5]
# iterating a list
for x in my_list:
print(x) 
Iterating a String
Example :
Example of Iterating a String
# for loops
name = "James"
# iterating a string
for x in name:
print(x) 
The range () Function
We use the range () function to generate a specified number of loops on a set of code.
Example :
for number in range(5):
print("Hello ") 
Note :
range () function here is not the values 0 to 5 , values 0 to 4 . In our program
range (5) function will generate numbers 0 to 4.
Let’s Look at the example below. You can see the range() function’s index numbers
too
for number in range(5):
print("Hello", number) 
- range() function defaults to 0 as a starting value. But we can determine the starting value by adding a new parameter.
Example :
You can see that our index numbers generated from 1 to 4.
for number in range(1,5):
print("Hello", number) 
- We can also set the number‘s increment value by adding a new third parameter.
Example :
- Generated from 1 to 10.
- The increment value is 2.
for number in range(1,10,2):
print("Hello", number) 
Nested Loops
Nested loops are basically a loop inside a loop.
Example :
In this program,
- the inner loop will be executed one time for each iteration of the outer loop.
for number in range(3):
for x in range(2):
print(f"({number}, {x})") 
