bd5aa22faf
Erase an unnecessary word from the initial description. Add an example function call above where the parameters are explained for a more visual learning experience.
54 lines
1.4 KiB
Markdown
54 lines
1.4 KiB
Markdown
---
|
|
title: Range Method
|
|
---
|
|
# Range Function
|
|
If you need to iterate over a sequence of numbers, the built-in function range() comes in handy. It generates arithmetic progressions:
|
|
|
|
#### Example Usage
|
|
```py
|
|
for i in range(5):
|
|
print(i)
|
|
```
|
|
|
|
#### Output
|
|
```
|
|
0
|
|
1
|
|
2
|
|
3
|
|
4
|
|
```
|
|
|
|
#### Example with optional additional arguments
|
|
```py
|
|
# A range function call.
|
|
range(start, stop, step)
|
|
```
|
|
The first argument, *start*, is the starting number of the sequence.
|
|
|
|
The second argument, *stop*, means to generate numbers up to, but not including this number.
|
|
|
|
The third argument, *step*, is the amount to increment by. In other words, it's the difference between each number in the sequence. It defaults to 1 if step is not specified.
|
|
|
|
```py
|
|
for i in range(3, 12, 2):
|
|
print(i)
|
|
```
|
|
|
|
#### Output
|
|
```
|
|
3
|
|
5
|
|
7
|
|
9
|
|
11
|
|
```
|
|
|
|
#### Notes
|
|
In Python 2, there are 2 functions for going through a range of numbers: range() and xrange().
|
|
Out of these functions, xrange() is the "lazy" function, meaning it generates numbers as necessary instead of actually creating
|
|
a list of numbers and iterating through them. range(), on the other hand, makes an entire list of numbers and iterates through
|
|
this list. This makes it a strain on the memory in the case of really long lists.
|
|
|
|
In Python 3, the range() function mimics xrange() as the "lazy" variant, and xrange() itself has been removed.
|