嗨大成帶你五分鐘入門 python編程語言

了解Python的語法（第一個hello world）

print('Hello world!') #打印Hello world

字符串格式

name = '嗨大成'

print('Hello, %s' % name)? # Hello,嗨大成

print('Hello, {}'.format(name))? # string formatting? #也是上面的 Hello，嗨大成

定義函數

def add_one(x):

? ? return x + 1

測試

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))

定義類里面的2個函數

class Talker(object):

? ? def greet(self, name):

? ? ? ? print ('Hello, %s!' % name)

? ? def farewell(self, name):

? ? ? ? print ('Farewell, %s!' % name)

定義list

dynamic_languages = ['Python', 'Ruby', 'Groovy']

dynamic_languages.append('Lisp')

定義字典

numbered_words = dict()

numbered_words[2] = 'world'

numbered_words[1] = 'Hello'

numbered_words[3] = '!'

循環(huán)

while True:?

? ? if value == wanted_value: #判斷條件

? ? ? ? break

? ? else:

? ? ? ? pass

定義多行字符串

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.

'''

源代碼上拆分長字符串

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).')

循環(huán)

for x in xrange(1, 4):

? ? print ('Hello, new Python user!'

? ? ? ? ? ?'This is time number %d') % x

列表

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

print(l)

# [0, 1, 4, 9]

有條件的

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

print(squares)

# {0, 4}