price in products: # A if price not in unique_price_list: #B unique_price_list.append(price) return len(unique_price_list) products = [ (143121312, 100), (432314553, 30), (32421912367, 150), (937153201, 30) ] print('number of unique price is: {}'.format(find_unique_price...
To check if a string is empty or whitespace using the len() function in Python, we will use the following steps.First, we will find the length of the input string using the len() function. We will store the length in a variable str_len. Now, we will check if the length of the...
Even better, it can track the changes of the object after the changes of the variablefrom watchpoints import watch a = [] watch(a) a = {} # Trigger a["a"] = 2 # Trigger Without doubts, it works whenever the object is changed, even if it's not in the same scopefrom watch...
# Accessing a previously unassigned variable is an exception. # See Control Flow to learn more about exception handling. some_unknown_var # Raises a NameError Python支持三元表达式,但是语法和C++不同,使用if else结构,写成: # if can be used as an expression # Equivalent of C's '?:' ternary ...
tkinter.BooleanVar() # 创建一个复选框 check1 = tkinter.Checkbutton(win,text = "张三",variable = res1) check1.pack() res2 = tkinter.BooleanVar() check2 = tkinter.Checkbutton(win,text = "李四",variable = res2) check2.pack() res3 = tkinter.BooleanVar() check3 = tkinter.Checkbutton...
importjava.util.Scanner;publicclassHappyProgram{publicstaticvoidmain(String args[]){Scannerinput_a=newScanner(System.in); System.out.print("Enter a number: ");intYourNumber=input_a.nextInt();if(YourNumber >10) System.out.println("Your number is greater than ten") ;if(YourNumber <=10) ...
Many chapters in this tutorial end with an exercise where you can check your level of knowledge. See all Python Exercises Python Examples Learn by examples! This tutorial supplements all explanations with clarifying examples. Python Quiz Test your Python skills with a quiz. ...
scalar or array-likeObject to check for null or missing values.Returns---bool or array-like of boolFor scalar input, returns a scalar boolean.For array input, returns an array of boolean indicating whether eachcorresponding element is missing.See Also---notna : Boolean inverse of pandas.isna....
Checkset: num1={1,1,1}. A result variable is created and assigned a boolean value based on whether all elements of num1 are equal to each other. If so, the result is True and it prints "all elements are equal". Otherwise, the result is False, printing "All elements are not equal...
Method 2: Using the isfunction() of the inspect module The isfunction() function of the inspect module can be used to determine if the variable is a function or not. It returns a boolean value True if it is a function else returns False. Additionally, to utilize this, you must first ...