Note*: Most of these notes are for software called "Snakify" which helps you learn Python Code.*

Terminology/Functions

print() is used to output data in Python

input() We use this function to input data into a program. It reads a single line of text, as a String unless specifically specified with other code.

# Words that come after this will be ignored when you run the code. They are called comment(s).

int() this transforms strings into integers,

int(input() this transforms ***input ***strings into integers

str  transforms integers to strings

sep = used to combine strings together

+ used to combine strings

end = By default, each print statement ends with a new line. With the end function, we can change that to end with a space instead to increase readability in an IDE window.

Use of the Asterisk *

• Can be used as multiplication/exponentiation (see math)

• Can be used with strings and integers to repeat string segments

Example

Input :

Output

Variable(s)

• When writing a complex program, you usually can't print the answer to your calculation right away. Instead, you use variables to store intermediate results.

• The name can be any string of Latin characters mixed with numbers and the underscore _ but cannot start with a number. So, much3q1 is a valid name for a variable, and 2pac is not. The variable can also start with an underscore _

• *The assignment operator is =. This can define a variable

  • Eg. a = 3   #a is the variable and 3 is the value of a

• The more variables you introduce, and the more logical the names are, the more readable your code will be.

String concatenation

Strings

• A string is a set of characters that a program interprets as a word

• doesn't matter what quotation marks will you use to define a string: these ' ' or these " "

• Check example for more information

You can turn an integer into a string with str

Escape Characters

• Some keys cannot be typed directly into a string variable, such as the “tab” or “enter” keys.

• In order to print these keys, we need an “escape character” in the text to tell python that the next character to be interpreted is something different than the regular text.

• In python, the escape character is a backslash, “\”, which is then immediately followed by a single character.

• This is useful so that we can also print characters such as quotes without python interpreting that quote ending the string we want printed.

Here are some examples including printing a new line, a tab, quotes, or even to print the backslash itself.

Input

print(“Hi.\nA new line with \\n.”)

print(“Quotes \’ and \” are easy as well!”)

Output

Hi.

A new line with \n.

Quotes ‘ and “ are easy as well!

Math/Calculations

print(5 + 10) #the plus sign (+) represents addition

print(3 * 7, (17 - 2) * 8)  #the asterisk (*) represents multiplication, the minus sign (-) represents subtraction. The comma (,) represents that the 2 equations are separate

#NOTE: during output, the comma will disappear and show 2 answers with a space in between ((eg. 21 120) >>> answers for the question above)

print(2 ** 16)  # two stars are used for exponentiation (2 to the power of 16)

print(37 / 3)  # single forward slash is a division

print(37 // 3)  # double forward slash is an integer division

# it returns only the quotient of the division (i.e. no remainder)

print(37 % 3)  # percent sign is a modulus operator

# it gives the remainder of the left value divided by the right