SimpleExamples - Python Wiki (original) (raw)

Here are some samples to help get a better idea of Python's syntax:

Hello World (the traditional first program)

String formatting

name = 'Monty' print('Hello, %s' % name)
print('Hello, {}'.format(name))

Defining a function

def add_one(x): return x + 1

Testing variable equality

x = 1 y = 2 print 'x is equal to y: %s' % (x == y) z = 1 print 'x is equal to z: %s' % (x == z) names = ['Donald', 'Jake', 'Phil'] words = ['Random', 'Words', 'Dogs'] if names == words: print 'Names list is equal to words' else: print "Names list isn't equal to words" new_names = ['Donald', 'Jake', 'Phil'] print 'New names list is equal to names: %s' % (new_names == names)

Defining a class with two methods

class Talker(object): def greet(self, name): print 'Hello, %s!' % name def farewell(self, name): print 'Farewell, %s!' % name

Defining a list

dynamic_languages = ['Python', 'Ruby', 'Groovy'] dynamic_languages.append('Lisp')

Defining a dictionary

numbered_words = dict() numbered_words[2] = 'world' numbered_words[1] = 'Hello' numbered_words[3] = '!'

Defining a while loop

while True: if value == wanted_value: break else: pass

Defining multiline strings

string = '''This is a string with embedded newlines. Also known as a tripled-quoted string. Whitespace at the beginning of lines is included, so the above line is indented but the others are not. '''

Splitting a long string over several lines of source code

string = ('This is a single long, long string' ' written over many lines for convenience' ' using implicit concatenation to join each' ' piece into a single string without extra' ' newlines (unless you add them yourself).')

Defining a for loop

for x in xrange(1, 4): print ('Hello, new Python user!' 'This is time number %d') % x

List comprehension

l = [x**2 for x in range(4)] print(l)

Set comprehension with condition

squares = {x**2 for x in [0,2,4] if x < 4} print(squares)

CategoryDocumentation

BeginnersGuide/Programmers/SimpleExamples (last edited 2020-03-20 17:37:52 by MarcAndreLemburg)