在case的标量,也可以是多值,多值之间通过|分割(与C、JAVA的switch-case不同),例如: ... case 401|403|404: return "Not allowed" match-case只有OR模式,没有AND模式 匹配枚举 可以通过定义枚举值来进行条件匹配,match-case看上去是把枚举值当做标量来处理。 class Color(): RED = 1 GREEN = 2 BLUE =...
Structural pattern matching has been added in the form of a match statement and case statements of patterns with associated actions. Patterns consist of sequences, mappings, primitive data types as well as class instances. Pattern matching enables programs to extract information from complex data type...
但是我们无法从fp中读取更多文本,因为在with块结束时,调用了TextIOWrapper.__exit__方法,它关闭了文件。 示例18-1 中的第一个标注点提出了一个微妙但至关重要的观点:上下文管理器对象是在评估with后的表达式的结果,但绑定到目标变量(在as子句中)的值是上下文管理器对象的__enter__方法返回的结果。 恰好open()函...
Pattern matching is done withmatch/casekeywords. It was introduced in Python 3.10 under the namestructural pattern matching. Pattern matching is a powerful control flow construct that allows us to compare a value against a series of patterns and then execute code based on which pattern matches. I...
class Point: x: int y: int def location(point): match point: case Point(x=0, y=0): print("Origin is the point's location.") case Point(x=0, y=y): print(f"Y={y} and the point is on the y-axis.") case Point(x=x, y=0): print(f"X={x} and the point is on the...
原文:Programming Basics: Getting Started with Java, C#, and Python 协议:CC BY-NC-SA 4.0 一、编程的基础 视频游戏、社交网络和你的活动手环有什么共同点?它们运行在一群(或多或少)程序员在很远很远的地方编写的软件上。在我们这个技术驱动的社会中,小工具和硬件只是硬币更明显的一面。在这一章中,我们将...
return: """ if not random_code_pool: code_pool = string.ascii_uppercase + string.digits random_code_pool = [] for i in range(num): s = '' for _ in range(length): s += random.choice(code_pool) if s and s not in random_code_pool: random_code_pool.append(s) # 写入方法。
Note: Boolean expressions that combine two Boolean operands are a special case of a more general rule that allows you to use the logical operators with all kinds of operands. In every case, you’ll get one of the operands as a result....
from__future__importunicode_literalsfromdjango.utils.encodingimportpython_2_unicode_compatible@python_2_unicode_compatibleclassMyClass(object):def__str__(self):return"Instance of my class" This technique is the best match for Django’s porting philosophy. ...
class Meta: verbose_name = '手机验证码' verbose_name_plural = verbose_name 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 实现逻辑 import http.client import urllib # 使用互亿无线 host = "106.ihuyi.com" sms_send_uri = "/webservice/sms.php?method=Submit" ...