What is the difference between for loop and while loop in Python
What this article shares to you is about the difference between the for cycle and the while cycle in Python. The editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.
What is the difference between a for loop and a while loop? As we all know, loop is one of the most basic and common knowledge points in Python. Let's learn about for loop and while loop, and compare and analyze the differences between them, so as to help Python beginners better grasp their content and application. Let's take a look at them.
1. For cycle
(1) concept
The for loop can traverse the items of any sequence, such as strings, lists, tuples, dictionaries, collections, and so on, and get each element in the sequence one by one.
(2) Code example:
The terminal displays the result:
2. While cycle
(1) concept
The while loop executes the code snippet below it until its corresponding Boolean expression is False. Specifically, the while loop is similar to the if statement in that it checks whether a Boolean expression is true or false, except that the code snippet below it is not executed only once, but is called back to the location of while after execution, which is repeated until the while expression is False.
(2) Code example:
The terminal displays the result:
3. The difference between for cycle and while cycle.
Comparing the for loop and the while loop, it is not difficult to find that there is a big difference in the use of else. If the else statement is used together with the while loop statement, the else statement is executed when the condition becomes False. If the else statement is used with the for loop statement, the else statement block is executed only when the for loop terminates normally. In addition, the number of cycles of the for loop is very different from that of the while loop. The former depends on the number of elements the data contains, while the latter depends on when the condition is False. In terms of loop values, for loops are more powerful than while loops, so if you encounter scenarios where loops are valued, you should use for loops. On the other hand, for loops can only loop over a collection of things, while while can do any kind of loop. However, the while loop is error-prone, and in most cases the for loop is a good choice.
After you understand the difference between the for loop and the while loop, you must have a deeper understanding of the loop in Python. In fact, the difficulty of this part of knowledge is mainly to understand the "jumping" of the code. As long as you understand this, no matter how many looping statements can be sorted out.
The above is the difference between the for loop and the while loop in Python. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.
