逻辑AND–如果两个值都为真(或在许多情况下为非零),则返回真值: a =0b =8if(aandb):print'true'else:print'false'`False` 或者 逻辑OR–如果任一值为真,则返回真值: a =0b =8if(aorb):print'true'else:print'false'`True` 没有 逻辑非–反转运算符。真变假,假变真: a =0b =8ifnot(aandb...
allkernels(twice to skip confirmation).Creatednewwindowinexisting browser session.To access the notebook,openthisfileina browser:file:///home/wesm/.local/share/jupyter/runtime/nbserver-185259-open.htmlOr copy and paste oneofthese URLs:http://localhost:8888/?token=0a77b52fefe52ab83e3c35dff8de...
我还使用pytest为一些较大的示例编写了单元测试——我发现它比标准库中的unittest模块更易于使用且功能更强大。你会发现,通过在操作系统的命令行 shell 中键入python3 -m doctest example_script.py或pytest,可以验证本书中大多数代码的正确性。示例代码仓库根目录下的pytest.ini配置确保 doctests 被pytest命令收集和...
AI代码解释 defcalculate_average(grades):ifnot grades:print("The list of grades is empty.")returnNonetry:total=sum(grades)average=total/len(grades)returnaverage except IndexErrorase:print(f"Error: {e}")returnNone grades=[85,90,78]average=calculate_average(grades)ifaverage is not None:print(f...
结果值1 if 判断条件 else 结果2 for 自定义变量 in 序列 (6)、对象的__doc__属性 对象的注释内容(文档字符串)# 用三层引号注释的内容 示例: defa():"""a"""passdefb():# 注释内容要写在语句前pass"""b"""print(a.__doc__,b.__doc__) ...
Mutating changes an object, while assignment changes a variable (see The 2 types of "change" in Python). Mutable An object that can be changed (i.e. mutated). The "value" of a mutable object can change (meaning the data it contains). An immutable object is one that cannot change. Im...
if ord(e) > 128: print("^ ", end='') else: print(' ', end='') print() s = "【a, b,中" find_chinese_char(s) s = "([10, 2,3,4】“])" find_chinese_char(s) 如果经常受困于这些错误,建议阅读代码里面的中、英文符号 - 知乎 (zhihu.com)。
if 'Runoob' in sites : print('Runoob 在集合中') else : print('Runoob 不在集合中') # set可以进行集合运算 a = set('abracadabra') b = set('alacazam') print(a) print(a - b) # a 和 b 的差集 print(a | b) # a 和 b 的并集 print(a & b) # a 和 b 的交集 print(a ^ ...
import pandas as pdfuncs = [_ for _ in dir(pd) if not _.startswith('_')]types = type(pd.DataFrame), type(pd.array), type(pd)Names = 'Type','Function','Module','Other'Types = {}for f in funcs:t = type(eval("pd."+f))t = Names[-1 if t not in types else types.inde...
both_true = x and y # True if both are True either_true = x or y # True if at least one is True negation = not x # Reverse boolean value print("Both True?", both_true) print("At least one True?", either_true) print("Negation of x:", negation) # Assignment operat...