'payment_method_variable', 'package_price_group']) print("未将‘NULL’替换成np.nan,查看train_data的缺失值:\n",na_count(data_pos_1)) #将str字段中的null转换成空值 data_pos_1.loc[data_pos_1['is_vice_card']=='NULL','is_vice_card'] = np.nan data_pos_1.loc[data_pos_1['online...
[0E9C:0284][2018-07-26T22:15:55]i000: Initializing string variable 'ShortVersion' to value '3.6'[0E9C:0284][2018-07-26T22:15:55]i000: Initializing numeric variable 'ShortVersionNoDot' to value '36'iable 'Include_test' to value '1'[0E9C:0284][2018-07-26T22:15:55]i000: ...
题目 下列Python语句的输出结果是【 】。counter=0; num=0def TestVariable(): global counter for i in range(4):counter+=1 num=5 TestVariable()print(counter, num) A.4 0B.4 10C.7 0D.7 10 相关知识点: 试题来源: 解析 A 反馈 收藏 ...
==用于比较变量的值,is用于比较变量的id. a = 10 b = 10 # 错误的方式! a is b 上面的a is b,相当于id(a) == id(b),应该不是我们的意图。为了简单记忆,Python里面绝大多数情况都是使用==,空值(None)的检查才用is来判断,比如: def foo(a, b): if a is None: ... 32. 将布尔变量与True...
if variable is None: 为什么会这样? 由于None是python中NoneType唯一的单例对象,所以我们可以使用is操作符来检查变量中是否有None。 引用is号文件, The operators is and is not test for object identity: x is y is true if and only if x and y are the same object. x is not y yields the inverse...
if name is not None print(name) If语句漏掉了冒号,不符合Python的语法规范,所以程序就会报错 invalid syntax。 而异常则是指程序的语法正确,也可以被执行,但在执行过程中遇到了错误,抛出了异常,比如下面的3个例子: 代码语言:javascript 复制 10 / 0 Traceback (most recent call last): File "<stdin>",...
df.info() <class 'pandas.core.frame.DataFrame'> RangeIndex: 6040 entries, 0 to 6039 Data columns (total 5 columns): UserID 6040 non-null int64 Gender 6040 non-null object Age 6040 non-null int64 Occupation 6040 non-null int64 Zip-code 6040 non-null object dtypes: int64(3), object(2...
if num % 2 == 0: @@ -383,7 +389,7 @@ 关键字 def 引入了一个函数 定义。在其后必须跟有函数名和包括形式参数的圆括号。函数体语句从下一行开始,必须是缩进的。 - 函数体的第一行语句可以是可选的字符串文本,这个字符串是函数的文档字符串,或者称为 docstring。(更多关于 docstrings 的信息请参考...
train.isnull().sum() impute_value = train['Age'].median() train['Age'] = train['Age'].fillna(impute_value) test['Age'] = test['Age'].fillna(impute_value) train['IsFemale'] = (train['Sex'] == 'female').astype(int)
Importantly, a reference to the instance of the service saved in a class variable will be None when the app restarts. The restart-stop code above re-initializes the service to obtain a new reference to the service so that it can be stopped....