Expression statements

https://docs.python.org/3/reference/expressions.html

https://stackoverflow.com/questions/4728073/what-is-the-difference-between-an-expression-and-a-statement-in-python

INTRODUCTION

All Python expressions can be used as statements. Expressions can be reduced to some kind of 'value', but in statements we use 'side effects' (function calls). Expression statements are often used in the interactive mode.

# Expression statements.

2 + 5                   # arithmetic or boolean operations
name                    # variable
alist[idx]              # with lists, tuples, dicts
[x for x in iterable]   # list|dict|set comprehension
some_function()         # function call
some_object.method()    # method call
print(word)             # function in Py3 (the result is None and a message)
yield x ** 2            # in generators
lambda x: x ** 2        # anonymous function (lambda function)
A if condition else B   # conditional expression
y := f(x)               # assignment expression (Py3.8+)

# Statements, but not expressions.

print word          # statement in Py2
a = 5               # assignment
return name
if condition: pass
def some_function(): pass
class FirstClass: pass