[程式語言] Python 筆記

環境安裝

System Setup for Python, PyDev and Eclipse 

基本語法

print "Be careful not to fall off!"

>>> word = 'Hello Python'
>>> word
'Hello Python'
>>> word[2]
'l'
>>> word[0:2]
'He'
>>> word[2:4]
'll'
>>> 

 +---+---+---+---+---+ 
 | H | e | l | p | A |
 +---+---+---+---+---+ 
 0   1   2   3   4   5 
-5  -4  -3  -2  -1

>>> word = "ABCDE"
>>> word
'ABCDE'
>>> len(word)
5

>>> x = int(raw_input("Please enter a number: "))
>>> if x < 0:
...      x = 0
...      print 'Negative changed to zero'
... elif x == 0:
...      print 'Zero'
... elif x == 1:
...      print 'Single'
... else:
...      print 'More'
...

>>> # Measure some strings:
... a = ['cat', 'window', 'defenestrate']
>>> for x in a:
...     print x, len(x)
... 
cat 3
window 6
defenestrate 12

in 這個指令,可以檢查字串是否在某個變數裡面

若存在會return True
ex:
print 'B' in string_test