if condition_1: statement_block_1elif condition_2: statement_block_2else: statement_block_3 如果 "condition_1" 为 True 将执行 "statement_block_1" 块语句 如果 "condition_1" 为False，将判断 "condition_2"如果"condition_2" 为 True 将执行 "statement_block_2" 块语句 如果 "condition...
for的扩展(一般不太用)官方参考:https://docs.python.org/3/reference/compound_stmts.html#the-for-statement 图片出处:https://www.cnblogs.com/dspace/p/6622799.html Python 没有 switch / case 语句。为了实现它,我们可以使用字典映射:#官方的解释说,“用if... elif... elif... else序列很容易来实现...
Python3 条件控制Python 条件语句是通过一条或多条语句的执行结果(True 或者 False)来决定执行的代码块。 可以通过下图来简单了解条件语句的执行过程:代码执行过程:if 语句Python中if语句的一般形式如下所示:if condition_1: statement_block_1 elif condition_2: statement_block_2 else: statement_block_3...
如果 "condition_2" 为False,将执行"statement_block_3"块语句。每个条件后使用冒号(:)表示满足条件后要执行的语句块。条件控制中使用缩进来划分语句块,相同缩进数的语句在一起组成一个语句块。在Python中没有switch – case语句。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #! /usr/bin/python3 ...
While the match-case statement is a powerful tool, its impact on the performance of Python code, particularly in large-scale applications, should be considered. In scenarios with a large number of cases, or complex pattern matching, performance can potentially be impacted. Profiling and testing yo...
In Python 3, you can’t, and the 2to3 script is not smart enough to split the import statement into two. The solution is to split the import statement manually. So this two-in-one import: import constants, sysNeeds to become two separate imports: from . import constants import ...
但是，在 Python 中，我们看不到 switch-case 或者相近的语法结构，这是为什么呢？2、Python 为什么不支持 switch?官方文档中有一篇 FAQ 包含了这个问题：Why isn’t there a switch or case statement in Python?FAQ 即 Frequently Asked Questions 的缩写，表示常见问题，官方列了 27 个常见问题，完整清单在此...
We will start with theifstatement, which will evaluate whether a statement is true or false, and run code only in the case that the statement is true. Info:To follow along with the example code in this tutorial, open a Python interactive shell on your local system by running thepython3co...
switch/case的替代方案 在python中并没有switch和case的分支选择语句,但是使用if或dict也能轻松实现。 例如,使用dict实现等值的分支选择: 1 2 3 4 5 6 7 8 9 10D = {"apple": 8.0,"pear": 3.5,"orange": 2.5,"banana": 2.5 } fruit ="banana"print(D[fruit]) ...
switch/case的替代方案 在python中并没有switch和case的分支选择语句,但是使用if或dict也能轻松实现。 例如,使用dict实现等值的分支选择: 1 2 3 4 5 6 7 8 9 10D = {"apple": 8.0,"pear": 3.5,"orange": 2.5,"banana": 2.5 } fruit ="banana"print(D[fruit]) ...