Python 入門

• Python : http://www.python.org/

• MacBook% python -V

Python 2.6.1

• MacBook% python3 -V

Python 3.1.2

• MacBook% cd lorepos/svn/elmarverde/lang/python/

• Hello Python!
  • MacBook% vim hello.py

#!/usr/bin/env python 3


print("Hello","Python!")

• • MacBook% python hello.py

('Hello', 'Python!')

• • MacBook% python3 hello.py

Hello Python!

• オブジェクト参照
  • MacBook% vim object.py

#!/usr/bin/env python3


x = "red"
y = "green"
z = "refactoring"


print(x, y, z) # red green refactoring
z = x
print(x, y, z) # red green red
y = z
print(x, y, z) # red red red


print("## init date ##")
x = "red"
y = "green"
z = "refactoring"


print(x, y, z) # red green refactoring

• • MacBook% python object.py

('red', 'green', 'refactoring')
('red', 'green', 'red')
('red', 'red', 'red')
## init date ##
('red', 'green', 'refactoring')
MacBook% python3 object.py
red green refactoring
red green red
red red red
## init date ##
red green refactoring

• コレクション型 : 参考 => イミュータブル - Wikipedia
  • tuple : イミュータブル
  • list : ミュータブル
    • MacBook% vim collection.py

#!/usr/bin/env python3


tuple = ("Tokyo", "Osaka", "Nagoya")
list = ["Aomori", "Fukuoka", "Shimane"]


print("tuple is ")
print tuple


print("list is ")
print list

• • • MacBook% python collection.py

tuple is
('Tokyo', 'Osaka', 'Nagoya')
list is
['Aomori', 'Fukuoka', 'Shimane']
MacBook% python3 collection.py
File "collection2.py", line 7
print tuple
^
SyntaxError: invalid syntax

• • • MacBook% vim collection.py

#!/usr/bin/env python3


tuple = ("Tokyo", "Osaka", "Nagoya")
list = ["Aomori", "Fukuoka", "Shimane"]


print("tuple is ")
print (tuple)


print("list is ")
print (list)
MacBook% python collection.py
tuple is
('Tokyo', 'Osaka', 'Nagoya')
list is
['Aomori', 'Fukuoka', 'Shimane']

• • • MacBook% python3 collection.py

tuple is
('Tokyo', 'Osaka', 'Nagoya')
list is
['Aomori', 'Fukuoka', 'Shimane']

• • • MacBook% vim collection.py

#!/usr/bin/env python3


tuple = ("Tokyo", "Osaka", "Nagoya")
list = ["Aomori", "Fukuoka", "Shimane"]


print("tuple is ", tuple)


print("list is ", list)

• • • MacBook% python collection.py

('tuple is ', ('Tokyo', 'Osaka', 'Nagoya'))
('list is ', ['Aomori', 'Fukuoka', 'Shimane'])

• • • MacBook% python3 collection.py

tuple is ('Tokyo', 'Osaka', 'Nagoya')
list is ['Aomori', 'Fukuoka', 'Shimane']

• リポジトリへコミット！
  • MacBook% svn add *.py

A collection.py
A hello.py
A object.py

• • MacBook% cd lorepos/svn/elmarverde
  • MacBook% svn commit -m "first python commit."

Adding lang/python/collection.py
Adding lang/python/hello.py
Adding lang/python/object.py
Transmitting file data ....
Committed revision 2.