PYTHON - FOR STARTERS
PYTHON - FOR STARTERS
Embedded Files
Variables
Variables
A variable is a reserved space in a computer's memory that can hold a specific value which is referenced by a specific name in the program.
Variables can be declared with a unique name as a place holder to store a specific value.
Unlike other languages you do not need to declare the variable type.
Variables should start with a lower case letter, cannot include spaces, and if their name is more than one word should be written like this: userName, playerID, difficultyLevel etc.
Variable Types
Variable Types
String
Integer
Float
Boolean
Lists (similar to arrays in other languages)
See examples of variables below:
name = "john smith" #String
address = " 34 red st" #String
age = 10 #integer / number
height = 1.82 #float / number with a decimal
alive = True #boolean (true or false)
Comment your code
Comment your code
All code should be clearly commented with instructions, hints, and reminders to the programmer(s) about what the code actually does.
#This is a comment and will not be executed in the code when run
Print to the screen
Print to the screen
The text in the brackets will be printed to the console. The text known as a string needs be surrounded with quotation marks " "
print("Hello World!")
#\n adds a new line, the code below prints an adventure game title with underlining on the next line.
print("Welcome to my dungeon adventure game! \n ----------------------------------")
Concatenation - print joined strings and/or variables together
Concatenation - print joined strings and/or variables together
The word concatenate simply means 'to join' or 'to link'.
We can concatenate strings with variables and strings using the '+' symbol.
print("Hello my name is " + name)
If you try to concatenate variable which are numbers, you MUST cast each variable to a string in the output / print code using the str() command. See the examples below:
print("Hi, I am " + str(age) + " years old. I am " + str(height) + " metres tall.")
print("To improve to level " + str(level) + " in weightlifting, I must increase the number of repetitions of 50kg I lift to " + str(reps) + ". "
There is another method of printing numbers without casting to a string. This method uses commas. See the examples below:
print("Hi, I am",str(age),"years old. I am",str(height)",metres tall.")
print("To improve to level",str(level),"in weightlifting, I must increase the number of repetitions of 50kg I lift to",str(reps),". "
Read more about printing and variables on:
Read more about printing and variables on:
Print Statements and Variables Video
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