python-language-tester/python.py at master · hasanzaidi/python-language-tester · GitHub

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# Code snippets which can't really be expressed in unit test

# Throwing an exception

items = [1, 2]

if len(items) == 0:

raise ValueError("Empty list")

# Pass is a null operation (i.e. nothing happens). Useful to use temporarily as body for methods until they are fleshed

# out.

f = False

if f is True:

pass

else:

print("hello")

print("print line never gets called")

# _ can be used when you don't care about its value, e.g.

print()

for _ in range(5):

print("hello world")

# To create a custom exception class

class CustomError(Exception):

pass

# Creating a normal class

class A(object):

def __init__(self):

self.x = 'Hello'

self.y = 1

def add(self, arg: int):

self.y = self.y + arg

foo = A()

print(foo.x)

# Shows as error in IDE

foo.add("a")

print(foo.y)

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