1、加法(__add__)的算术运算调用减法(__sub__)的算术运算,减法(__sub__)的算术运算调用加法(__add__)的算术运算 class New_Init(int): def __add__(self,other): return int.__sub__(self,other) def __sub__(self,other): return int.__add__(self,other) >>> a = New_Init('5') ...
return new_function @print_log # 装饰器print_log函数 对 add函数 进行扩展 def add(a , b): ''' 求任意两个数的和 ''' r = a + b return r r=add(10 , 30) print('求和:',r) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. ...
1 >>> counter 1 >>> counter = counter + 1 >>> counter 2 >>> counter += 1 >>> counter 3 >>> counter += 1 >>> counter 4 首先我们创建一个变量counter,将0赋值给它改变量就是我们最初始的计数器。之后如果每次发现有交换机的IOS为最新版本我们就在该计数器上+1, 注意counter = counter...
ACounteris adictsubclass for counting hashable objects. It is an unordered collection where elements are stored as dictionary keys and their counts are stored as dictionary values. Counts are allowed to be any integer value including zero or negative counts. 一、创建 Counter() # 创建一个新的...
Counter() >>> c = Counter("gallahad")#从可迭代的字符串初始化counter >>> c Counter({'a': 3, 'l': 2, 'h': 1, 'g': 1, 'd': 1}) >>> c = Counter({'red':4,'blue':2})#从映射初始化counter >>> c Counter({'red': 4, 'blue': 2}) ...
def make_counter(init): counter = [init] def inc(): counter[0] += 1 def dec(): counter[0] -= 1 def get(): return counter[0] def reset(): counter[0] = init return inc, dec, get, reset 此函数的作用是做一个计数器,可以 用增加子函数 inc() 续一秒 用减少子函数 dec() 废一...
def counter(): count = 0 def increment(): nonlocal count count += 1 return count return increment counter_func = counter() print(counter_func()) # 输出: 1 print(counter_func()) # 输出: 22.1.2 递归与匿名函数(lambda表达式) 递归是函数直接或间接地调用自身的过程,常用于处理分治问题。例如...
def count_word_freq_one(self, save_to_file=False, word_freq_file=None): keywords = (word for word_list in self.data for word in word_list if word) self.words_freq_one = Counter(keywords) if save_to_file: words = [word for word in self.words_freq_one]...
from odps.udf import get_execution_context def h(x): ctx = get_execution_context() counters = ctx.get_counters() counters.get_counter('df', 'add_one').increment(1) return x + 1 df.field.map(h) Logview的JSONSummary中即可找到计数器值。
1. 找到Python的安装路径:首先确定Python的安装路径。默认情况下,Python会被安装在以下位置: -在Windows上:`C:\PythonXX`(其中`XX`是Python的主版本号,如Python 3.9的安装路径可能是`C:\Python39`)。 -在macOS上:`/Library/Frameworks/Python.framework/Versions/XX/bin`。