/usr/bin/python# -*- coding: UTF-8 -*-str='Hello World!'printstr# 输出完整字符串printstr[0]# 输出字符串中的第一个字符printstr[2:5]# 输出字符串中第三个至第六个之间的字符串printstr[2:]# 输出从第三个字符开始的字符串printstr*2# 输出字符串两次printstr+"TEST"# 输出连接的字符串 以...
The operand to the left of the = operator is the name of the variable and the operand to the right of the = operator is the value stored in the variable. For example − #!/usr/bin/python3counter=100# An integer assignmentmiles=1000.0# A floating pointname="John"# A stringprint(cou...
defdescribeNumber(number:int) ->str:ifnumber %2==1:return'An odd number. 'elifnumber ==42:return'The answer. 'else:return'Yes, that is a number. 'myLuckyNumber:int=42print(describeNumber(myLuckyNumber)) 如您所见,对于参数或变量,类型提示使用冒号将名称与类型分开,而对于返回值,类型提示使用...
type(object) Example to determine variable's type using type() methodDetermine the type of a string and an integer variable using the type() method.# Creating two variables test_string = "yes" test_number = 1 # Printing their types print("Type of test_string is:", type(test_string))...
print(variable_name):打印变量 在pycharm软件中,按住ctrl,鼠标点击以上字符可以弹出具体变量显示格式以print为例: print(*args, sep=' ', end='\n', file=None): *args: 要打印的一个或多个值, 多个值用逗号隔开 sep: seperator,分割符,默认是空格 ...
https://www.geeksforgeeks.org/ml-dummy-variable-trap-in-regression-models/***注意,One-hot-Encoding一般要去掉一列,不然会出现dummy variable trap,因为一个人不是male就是femal,它俩有推导关系*** In [8]: 代码语言:javascript 代码运行次数:0 运行 复制 # 便捷方法,用df全部替换 needcode_cat_columns...
* element, but enough space is malloc'ed so that the array actually * has room for ob_size elements. Note that ob_size is an element count, * not necessarily a byte count. */#definePyObject_VAR_HEAD\PyObject_HEAD\Py_ssize_t ob_size;/* Number of items in variable part *//* Noth...
Local variables are defined within a function and cannot be accessed outside it. A variable is assumed to be local unless explicitly declared as global using the global keyword.Example:var1 = "Python" def func1(): var1 = "PHP" print("In side func1() var1 = ",var1) def func2():...
<__main__.MyFirstClassobjectat0xb7b7faec>>>print(b) <__main__.MyFirstClassobjectat0xb7b7fbac>>> 这段代码从新类实例化了两个对象,命名为a和b。创建一个类的实例只需要输入类名,后面跟着一对括号。它看起来很像一个普通的函数调用,但 Python 知道我们调用的是一个类而不是一个函数,所以它知道它...
(y_test, y_pred)print(f"模型准确率:{accuracy:.2f}")# 预测新的例子# 假设我们有一个新的例子:年龄30,体重70公斤,经验中级,健康状况好new_example = [[30,70,1,0]]# 特征编码:年龄, 体重, 经验(中级=1, 其他=0),健康状况(好=0, 其他=1)print("新例子是否适合爬山: ","适合"ifclf.predict...