How to use the range() function to generate an integer sequence in Python 3.x

Python is a powerful programming language that provides many convenient tools and functions to simplify the coding process. One of the very useful functions is range(), which allows us to generate sequences of integers. This article will introduce how to use the range() function to generate a sequence of integers in Python 3.x, with code examples.

range() function is a built-in function that can generate a sequence of integers. It has three common uses:

1. range(stop): generates an integer sequence from 0 to stop - 1;
2. range(start, stop): Generate an integer sequence from start to stop - 1;
3. range(start, stop , step): Generate an integer sequence from start to stop - 1, with a step size of step.

The following is a simple example showing the basic usage of the range() function to generate a sequence of integers:

# 生成从 0 到 4 的整数序列
for i in range(5):
  print(i, end=' ')
# 输出：0 1 2 3 4

# 生成从 2 到 6 的整数序列
for i in range(2, 7):
  print(i, end=' ')
# 输出：2 3 4 5 6

# 生成从 1 到 10 的偶数序列
for i in range(2, 11, 2):
  print(i, end=' ')
# 输出：2 4 6 8 10

In the first example, we Using range(5) generates a sequence of integers from 0 to 4. In the for loop, i takes the value of each integer in the sequence and prints it out.

In the second example, we used range(2, 7) to generate a sequence of integers from 2 to 6. Likewise, in the for loop, i evaluates to each integer in the sequence.

In the third example, we used range(2, 11, 2) to generate a sequence of even numbers from 2 to 10. By specifying a step size of 2, we only generate even numbers.

In addition, we can also convert the output of the range() function into a list so that the sequence can be saved to a variable for subsequent processing. For example:

# 将生成的整数序列保存到列表中
numbers = list(range(1, 6))
print(numbers)
# 输出：[1, 2, 3, 4, 5]

In this example, we generated a sequence of integers from 1 to 5 using range(1, 6) and converted it into a list numbers.

To summarize, the range() function is a powerful tool in Python for generating integer sequences. It can generate integer sequences of different ranges and different step sizes according to our needs. By combining the for loop, we can easily traverse the generated integer sequence to achieve various programming tasks.

I hope this article can help you understand and learn to use the range() function to generate an integer sequence, and handle integer operations more efficiently when writing Python programs.

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