PrintVariablePrintMultipleVariableFormatPrintFString 旅行图 journey title Python中print打印变量的使用 section 基本用法 [*] --> 定义变量 定义变量 --> 使用print函数打印变量的值 使用print函数打印变量的值 --> 结束 section 打印多个变量 [*] --> 定义多个变量 定义多个变量 --> 使用print函数打印这些变量...
sigma[0,i]=np.std(X[:,i])# 标准差 #print(mu)#print(sigma)X_norm=(X-mu)/sigmareturnX_norm,mu,sigma #计算损失 defcomputeCost(X,y,theta):m=y.shape[0]#J=(np.sum((X.dot(theta)-y)**2))/(2*m)C=X.dot(theta)-yJ2=(C.T.dot(C))/(2*m)returnJ2#梯度下降 defgradientDesc...
fruits = ["apple","banana","cherry"] x, y, z = fruits print(x) print(y) print(z) Try it Yourself » Learn more about unpacking in ourUnpack TuplesChapter. Video: Python Variable Names ❮ PreviousNext ❯ Track your progress - it's free! Log inSign Up...
thetahistory = [] #记录参数的变化 for meaninglessvariable in range(iterations): #默认步长为1,循环iterations次(迭代执行的次数) tmptheta = theta # 记录每次迭代时,当前假设函数的代价 costVector.append(computeCost(X,theta,y)) # 记录每次参数迭代的变化 thetahistory.append(list(theta[:,0])) # 遍...
>>> print(x) 1 >>> print(y) 2 >>> print(z) abcd You can reuse variable names by simply assigning a new value to them : >>> x = 100 >>> print(x) 100 >>> x = "Python" >>> print(x) Python >>> Other ways to define value ...
def__init__(self,name):self.name=name # Create an instance variable # Instance method defgreet(self,loud=False):ifloud:print('HELLO, %s!'%self.name.upper())else:print('Hello, %s'%self.name)g=Greeter('Will')# Construct an instanceofthe Greeterclassg.greet()# Call an instance method...
Integer variable The int is a data type that returns integer type values (signed integers); they are also called ints or integers. The integer value can be positive or negative without a decimal point. Example # create integer variable age = 28 print(age) # 28 print(type(age)) # <clas...
Python contains one special literalNone. We use it to specify a null variable. For example, value =Noneprint(value)# Output: None Run Code Here, we getNoneas an output as thevaluevariable has no value assigned to it. Collection Literals ...
main.py:9: error: Incompatible typesinassignment (expression hastype"float", variable hastype"int") main.py:14: error: Argument1to"multiply"has incompatibletype"Set[str]"; expected"Sequence[Union[int, float]]"Found2errorsin1file (checked1source file) ...
into a string variable>>>text ='Some text'>>># a floating point number>>>cost =3*123.45>>># a longer string>>>Name ='Mr'+' '+'Fred'+' '+'Bloggs'>>># a list>>>shoppingList = ['ham','eggs','mushrooms']>>># multiple assignment (a=1, b=2, b=3)>>>a, b, c =1,...