Learn to Program
Many people asked me to make a tutorial that teaches how to program and so here it is. I’ll be teaching how to program through problem solving which I think is the best way to learn. Python is the best first language and so I’ll use Python 3.5 to teach. And, based on your requests I will use PyCharm in this tutorial series.
I cover receiving input, printing to the screen, doing math, comparison operators, logical operators, if, elif, else and a whole lot more. The code and a transcript of the video can be found below to help you learn.
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Code and Transcript
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# Programming involves listing all the things that must happen to solve a problem # When writing a program first determine step-by-step what needs to happen # Then convert those steps into the language being Python in this situation # Every language has the following # 1. The ability to accept input and store it in many ways # 2. The ability to output information to the screen, files, etc. # 3. The ability to conditionally do one thing or another thing # 4. The ability to do something multiple times # 5. The ability to make mathematical calculations # 6. The ability to change data # 7. (Object Oriented Programming) Model real world objects using code # ---------- Hello World ---------- # Ask the user to input their name and assign it to the name variable # Variable names start with a letter or _ and then can contain numbers # Names are case sensitive so name is not the same as Name name = input('What is your name ') # Print out Hello followed by the name they entered print('Hello ', name) # You can't use the following for variable names # and, del, from, not, while, as, elif, global, # or, with, assert, else, if, pass, yield, break, # except, import, print, class, exec, in, raise, # continue, finally, is, return, def, for, lambda, # try # Single line comments are ignored by the interpreter ''' So are multiline comments ''' # ---------- MATH ON 2 VALUES ---------- # Ask the user to input 2 values and store them in variables num1 and num2 # split() splits input using whitespace num1, num2 = input('Enter 2 numbers : ').split() # Convert strings into regular numbers (integers) num1 = int(num1) num2 = int(num2) # Add the values entered and store in sum sum = num1 + num2 # Subtract the values and store in difference difference = num1 - num2 # Multiply the values and store in product product = num1 * num2 # Divide the values and store in quotient quotient = num1 / num2 # Use modulus on the values to find the remainder remainder = num1 % num2 # Print your results # format() loads the variable values in order into the {} placeholders print("{} + {} = {}".format(num1, num2, sum)) print("{} - {} = {}".format(num1, num2, difference)) print("{} * {} = {}".format(num1, num2, product)) print("{} / {} = {}".format(num1, num2, quotient)) print("{} % {} = {}".format(num1, num2, remainder)) # ---------- PROBLEM : MILES TO KILOMETERS ---------- # Sample knowing that kilometers = miles * 1.60934 # Enter Miles 5 # 5 miles equals 8.0467 kilometers # Ask the user to input miles and assign it to the miles variable miles = input('Enter Miles ') # Convert from string to integer miles = int(miles) # Perform calculation by multiplying 1.60934 times miles kilometers = miles * 1.60934 # Print results using format() print("{} miles equals {} kilometers".format(miles, kilometers)) # ---------- CALCULATOR ---------- # Receive 2 numbers separated by an operator and show a result # Sample # Enter Calculation: 5 * 6 # 5 * 6 = 30 # Store the user input of 2 numbers and an operator num1, operator, num2 = input('Enter Calculation: ').split() # Convert strings into integers num1 = int(num1) num2 = int(num2) # If, else if (elif) and else execute different code depending on a condition if operator == "+": print("{} + {} = {}".format(num1, num2, num1+num2)) # If the 1st condition wasn't true check if this one is elif operator == "-": print("{} - {} = {}".format(num1, num2, num1 - num2)) elif operator == "*": print("{} * {} = {}".format(num1, num2, num1 * num2)) elif operator == "/": print("{} / {} = {}".format(num1, num2, num1 / num2)) # If none of the above conditions were true then execute this by default else: print("Use either + - * or / next time") # Other conditional operators # > : Greater than # < : Less than # >= : Greater than or equal to # <= : Less than or equal to # != : Not equal to # ---------- IS BIRTHDAY IMPORTANT ---------- # We'll provide different output based on age # 1 - 18 -> Important # 21, 50, > 65 -> Important # All others -> Not Important # eval() converts a string into an integer if it meets the guidelines age = eval(input("Enter age: ")) # Logical operators can be used to combine conditions # and : If both are true it returns true # or : If either are true it returns true # not : Converts true into false and vice versa # If age is both greater than or equal to 1 and less than or equal to 18 it is true if (age >= 1) and (age <= 18): print("Important Birthday") # If age is either 21 or 50 then it is true elif (age == 21) or (age == 50): print("Important Birthday") # We check if age is less than 65 and then convert true to false or vice versa # This is the same as if we put age > 65 elif not(age < 65): print("Important Birthday") else: print("Sorry Not Important") # ---------- PROBLEM : DETERMINE GRADE ---------- # If age 5 go to kindergarten # Ages 6 through 17 goes to grades 1 through 12 # If age is greater then 17 then say go to college # Try to complete with 10 or less lines # Ask for the age age = eval(input("Enter age: ")) # Handle if age < 5 if age < 5: print("Too Young for School") # Special output just for age 5 elif age == 5: print("Go to Kindergarten") # Since a number is the result for ages 6 - 17 we can check them all # with 1 condition # Use calculation to limit the conditions checked elif (age > 5) and (age <= 17): grade = age - 5 print("Go to {} grade".format(grade)) # Handle everyone else else: print("Go to College") |
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