How to use the range() function to generate an integer sequence in Python 2.x

Python is a powerful programming language that provides many convenient tools and functions to help us write code more efficiently. One of the commonly used functions is the range() function, which is used to generate a sequence of integers, which is very convenient for us to perform loop iteration or generate a list. This article will focus on how to use the range() function to generate a sequence of integers in Python 2.x, and give some code examples. The

range() function has two uses in Python 2.x, one is range(stop), the other is range(start, stop, step) .

First, let's look at the first usage, which only gives a stop value. In this case, the range() function generates a sequence of integers starting from 0 and ending at stop-1. For example:

for i in range(5):
    print(i)

The output result is:

0
1
2
3
4

In the above code, we use range(5) to generate a sequence of integers from 0 to 4, and print it out using a for loop.

If we need to generate a sequence of integers within a specified range, we can use the second usage, which is to give the starting value, stop value and step size. For example:

for i in range(1, 10, 2):
    print(i)

The output result is:

1
3
5
7
9

In the above code, we use range(1, 10, 2) to generate a value starting from 1 and ending at 10, with a step size of 2 sequence of integers and print them out using a for loop.

It should be noted that the integer sequence generated by the range() function does not contain stop values. In the second usage, the step size can be a positive or negative number, and whether it is an increasing sequence or a decreasing sequence is determined based on the relationship between the starting value and the stopping value.

In addition to using the range() function in a loop, we can also convert its result into a list. For example:

my_list = list(range(1, 5))
print(my_list)

The output result is:

[1, 2, 3, 4]

In the above code, we use range(1, 5) to generate an integer sequence from 1 to 4, and use the list() function Convert it to a list.

In addition, we can also combine the range() function and the len() function to traverse the list. For example:

my_list = ['apple', 'banana', 'orange']
for i in range(len(my_list)):
    print(my_list[i])

The output result is:

apple
banana
orange

In the above code, we use range(len(my_list)) to generate an integer sequence with the same length as the list, and traverse it by index List elements.

In summary, the range() function is a commonly used function in Python 2.x, used to generate integer sequences. We can meet different needs through simple syntax and parameter adjustment, such as traversing a sequence in a loop, generating a specific range of integer sequences, converting a sequence into a list, etc. Mastering the usage of the range() function will make our code more efficient and concise.

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