Learn python the fast way
With this tutorial, you can learn everything you need to know to program with python in a very short time.
To use python, you need to install it to your system. Then, create a file with the .py ending. Run this file in terminal or command line with python <your-filename>.py
print("Hello World!") writes Hello World! to your terminal. print() can also print numbers and variables. Just remove the "" and write the variable or number inside the parenthesis.
The # symbol is used to show the beginning of a comment. Each character after the # symbol on that line will not be run by the computer. """ can also be used for multi-line comments, with three quotes at the beginning and at the end.
Variables are used to hold data.
- Numbers:
my_num = 3 - Strings(What programmers call text):
city = "Paris" - Lists:
grades = ["A", "B", "B+"] - Or objects:
df = pd.read_csv(fp)
You can do math with numeric variables:
x = 2
y = 3
z = x + y
In this case z will equal 5
If statements are used when you want to run a certain piece of code if a condition is true.
if x > 1:
print("x is greater than 1")
elif x < 1:
print("x is less than 1")
else:
print("x is equal to 1")
The for loop is used to run an action multiple times, with the values given in the loop. This snippet will print the numbers 0, 1, 2:
for x in range(0, 3):
print(x)
This will print each item in the list:
for item in my_list:
print(item)
The while loop is used to run an action as long as the condition is true. The following will print the value of x until x is greater than or equal to 10.
x = 0
while x < 10:
print(x)
x = x + 1
Use functions when you want to reuse a part of your code or want to split your code up to make it easier to understand. Functions must be defined before they are called.
# Define the function
def my_function(in_var):
print(in_var)
# Call the function
my_function(3)
The variable inside the parenthesis is a parameter. Parameters are used to give data to functions, which can then manipulate that data.
- import modules
- classes