How to create a list of numbers in a specified range in Python? (code example)

In Python, given two numbers r1 and r2 (defining range, maximum and minimum values), how to create a list of numbers with a given range? The following article will show you how to create a list of numbers in a specified range. I hope it will be helpful to you.

Method 1: Use a for loop

A way to create a list of numbers within a given range The simple way is: first create an empty list and append the subsequent items of each integer on each iteration of the for loop.

Example:

def createList(r1, r2): 
  
    # 判断范围R1和R2是否相等
    if (r1 == r2): 
        return r1 
  
    else: 
  
        # 创建空列表 
        res = [] 
  
        # 循环以将后续任务追加到列表，直到到达范围r2
        while(r1 < r2+1 ): 
              
            res.append(r1) 
            r1 += 1
        return res 
      
r1, r2 = -1, 1
print(createList(r1, r2))

Output:

[-1, 0, 1]
[-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6]

Method 2: Use list comprehension

We can also use list comprehension to achieve our goal. Just iterate "item" from r1 to r2 in a for loop and return all "item" as a list.

Example:

def createList(r1, r2): 
    return [item for item in range(r1, r2+1)] 
r1, r2 = -2, 4
print(createList(r1, r2))
r1, r2 = -4,6
print(createList(r1, r2))

Output:

[-2, -1, 0, 1, 2, 3, 4]
[-4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6]

Method 3: Using Pythonrange()

python There is a range() function in which creates a sequence of numbers from start to end and outputs each item in the sequence. We use range() with r1 and r2 and then convert the sequence to a list.

Example:

def createList(r1, r2): 
    return list(range(r1, r2+1)) 
r1, r2 = -2, 4
print(createList(r1, r2))
r1, r2 = -4,6
print(createList(r1, r2))

Output:

[-2, -1, 0, 1, 2, 3, 4]
[-4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6]

Method 4: Use numpy.arange()

python numpy.arange() will return a list with evenly spaced elements according to the interval. Here we set the interval to 1 as required to get the desired output.

Example:

import numpy as np 
def createList(r1, r2): 
    return np.arange(r1, r2+1, 1) 
r1, r2 = -2, 3
print(createList(r1, r2))

Output:

[-2 -1  0  1  2  3]

Related video tutorial recommendation: "Python Tutorial"

The above is this article The entire content, I hope it will be helpful to everyone's study. For more exciting content, you can pay attention to the relevant tutorial columns of the PHP Chinese website! ! !

The above is the detailed content of How to create a list of numbers in a specified range in Python? (code example). For more information, please follow other related articles on the PHP Chinese website!