First steps with pure Python

First steps with pure Python#

  • First objects of simple types, first variables, first function calls (with print())

  • A point on function calls (with print() and round())

https://python-cnrs.netlify.app/edu/lite/lab/index.html

Function calls#

There are built-in functions and the developers can of course define other functions. To call a function:

print("hello")

hello

Some functions return a result.

round(1.2)

1

It’s common to store the result in a variable:

my_var = round(1.2)

which can then be used:

print(my_var)

1

Dynamically strongly typed: types, objects and variables#

The function type returns the type of an object:

type("hello")

str

type(2)

int

type(2.0)

float

type(2 + 2)

int

type(2 + 2.0)

float

type(True)

bool

Variables are just tags pointing towards objects. New variables can be used when needed. They are not associated with a type but only with an object (which has a type)…

myvar = 1
print(myvar, type(myvar))

1 <class 'int'>

myvar = "hello"
print(myvar, type(myvar))

hello <class 'str'>
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