1.5 - Operations

You can do operations on numbers in Python. Some basic operations like addition, subtraction, multiplication and division can be done using special symbols.

  • a + b addition
  • a - b subtraction
  • a * b multiplication
  • a / b division

You can also use the pow function to get the exponent.

print(1 + 5)
print(5 - 3)
print(5 * 5)
print(pow(5, 5)) # pow(5, 5) is 5*5 or 25
print(6 / 2)
print(2 * (5 + 5))

Just like in math outside of computers, order of operations still applies (BODMAS, POMDAS, etc.). 2 * (5 + 5) does not equal 2 * 5 + 5.

Operations to strings

You can use some operators on strings too! The + operator can join strings and the * operator can repeat text.

In programming, joining strings is commonly referred to as string concatenation.

This example will print out "Hello John!" and "aaaaa"

name = "John"
print("Hello " + name + "!") # Hello John!
print("a" * 5) # aaaaa

You might notice that the string "Hello " has a space after it. Without the space, the program would show HelloJohn.

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