# Table of Contents
- Using a For loop to print the numbers from 1 to 10
- Using a While loop to print the numbers from 1 to 10
- Using a For loop to print the numbers from 10 to 1
- Using a While loop to print the numbers from 10 to 1
# Using a For loop to print the numbers from 1 to 10
Use the range() class to loop from 1 to 10 in a for loop, e.g.for num in range(1, 11):.
The range class takes start (inclusive) and stop (exclusive) argumentsand enables us to loop a specific number of times in for loops.
main.py
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# ✅ `for` loop 1 to 10 (including 10)for num in range(1, 11): print(num)# 👇️ [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]print(list(range(1, 11)))
The code for this article is available on GitHub
If you need to exclude 10 from the range, use the following code sample instead.
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# ✅ `for` loop 1 to 10 (excluding 10)for num in range(1, 10): print(num)# 👇️ [1, 2, 3, 4, 5, 6, 7, 8, 9]print(list(range(1, 10)))
We used the range() class to loop from 1 to 10 in afor loop.
Note that the first parameter of the range() class (the start value) is inclusive, whereas the stop value is exclusive.
The range() class iscommonly used for looping a specific number of times in for loops and takesthe following arguments:
| Name | Description |
|---|---|
start | An integer representing the start of the range (defaults to 0) |
stop | Go up to, but not including the provided integer |
step | Range will consist of every N numbers from start to stop (defaults to 1) |
If you only pass a single argument to the range() constructor, it isconsidered to be the value for the stop parameter.
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for num in range(10): print(num)# 👇️ [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]print(list(range(10)))
The example shows that if the start argument is omitted, it defaults to 0 and if the step argument is omitted, it defaults to 1.
Note that the range() class returns a range object, not a list.
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# 👇️ range(0, 10)print(range(10))# 👇️ [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]print(list(range(10)))
If you need to convert the range object to a list, pass it to thelist() class.
# The stop value is exclusive (up to, but not including)
If values for the start and stop parameters are provided, the start valueis inclusive, whereas the stop value is exclusive.
main.py
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# 👇️ for loop 1 to 10 (including 10)for num in range(1, 11): print(num)# 👇️ [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]print(list(range(1, 11)))
The code for this article is available on GitHub
If you need to exclude 10 from the range that is being iterated, use a stopvalue of 10.
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for num in range(1, 10): print(num)# 👇️ [1, 2, 3, 4, 5, 6, 7, 8, 9]print(list(range(1, 10)))
# Using a While loop to print the numbers from 1 to 10
To print the numbers from 1 to 10 in a while loop:
- Declare a new variable and initialize it to 1.
- Use a while loop to iterate for as long as the variable is less than or equalto
10. - Increment the variable by 1 on each iteration.
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number = 1while number <= 10: print(number) number += 1
The code for this article is available on GitHub
We declared a new variable and initialized it to 1.
The while loop iterates for as long as the number variable is less than orequal to 10.
On each iteration, we print the current value and increment the variable by 1.
Once the number variable is equal to 11, the condition is no longer met andwe exit the while loop.
# Using a while True loop to print the numbers from 1 to 10
You can also use a while True loop to print the numbers from 1 to 10 inPython.
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number = 1while True: if number > 10: break print(number) number += 1
The code for this article is available on GitHub
The while True loop iterates until the break statement is used.
We initialized the number variable to 1 just like we did in the previousexample.
On each iteration of the while loop, we check if the number variable isgreater than 10.
If the condition is met, we use the break statement to exit the while loop.
The break statement breaks out of theinnermost enclosing for or while loop.
If the condition isn't met, the number variable is in the specified range (1to 10), so we print its value and increment it by 1.
# Using a For loop to print the numbers from 10 to 1
To print the numbers from 10 to 1 using a for loop:
- Use the
rangeclass to get a range of the numbers from 1 to 10. - Use the
reversed()function to reverse the range. - Use a
forloop to iterate over the range from 10 to 1.
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for num in reversed(range(1, 11)): print(num)# 👇️ [10, 9, 8, 7, 6, 5, 4, 3, 2, 1]print(list(reversed(range(1, 11))))
The code for this article is available on GitHub
We used the range class to get a range object containing the numbers from1 to 10.
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# 👇️ [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]print(list(range(1, 11)))
The next step is to use the reversed() function to reverse the range.
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# 👇️ [10, 9, 8, 7, 6, 5, 4, 3, 2, 1]print(list(reversed(range(1, 11))))
The reversed function takes aniterator, reverses it and returns the result.
Once the range is reversed, we can use a for loop to iterate and print thenumbers from 10 to 1.
# Using a While loop to print the numbers from 10 to 1
To print the numbers from 10 to 1 using a while loop:
- Declare a new variable and initialize it to 10.
- Use a
whileloop to iterate for as long as the variable's value is greaterthan or equal to1. - Print the value of the variable and decrement it by
1.
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number = 10while number >= 1: print(number) number -= 1
The code for this article is available on GitHub
The number variable is initially set to 10.
On each iteration of the while loop, we print the current value of thevariable and decrement it by 1.
Once the number variable is set to 0, the condition is no longer met and weexit the while loop.
# Using a While True loop to print the numbers from 10 to 1
You can also use a while True loop to print the numbers from 10 to 1.
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number = 10while True: if number < 1: break print(number) number -= 1
The code for this article is available on GitHub
The while True loop iterates until the break statement is used.
On each iteration, we check if the number variable is less than 1.
If the condition is met, we use the break statement to exit the loop.
Otherwise, we print the variable and decrement its value by 1.
Once the number variable is set to 0, the condition is no longer met and weexit the while loop.
# Additional Resources
You can learn more about the related topics by checking out the followingtutorials:
- Using multiple variables in a For loop in Python
- Using a For or While Loop to take user input in Python
- Detect the Last item in a List using a for loop in Python
- How to restart a Loop in Python
- Python: How to calculate the MD5 Hash of a File
- python.exe: can't find __main__ module in Path
- How to exit an if statement in Python [5 Ways]
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