執行：shift+f10
注釋：ctrl+/
var =
10print
(var)
#check value
str
='thisisastring'
;print
(s[0])
#print the first char in string s;
print
(s[1:3
])#print string from index 1 to index 3(not include index 3)
alist =
['runoob'
,786
,2.23
,'john'
,70.2
]#note: for non-number str, '' is a must
print
(alist[1]
)#print the second element in alist;
#add element at the end of list
del alsit[0]
#delete the first element
#list.insert(index, obj)
alist.insert(0,
'hali'
)#insert 'hali' at the first position
difference from list, the value of tuple can』t be changed.
atuple =
('runoob'
,786
,2.23
,'john'
,70.2);
print
(atuple[1]
)
#d =
#值可以取任何資料型別，但鍵必須是不可變的，如字串，數字或元組。
#字典值可以沒有限制地取任何python物件，既可以是標準的物件，也可以是使用者定義的，但鍵不行。
tinydict =
print
(tinydict.values())
for key in tinydict.keys():
print
(key)
print
(tinydict[key]
)
a =
1b =
2if a ==
1and b ==2:
print
('case1'
)elif a ==
2or b ==3:
print
('case2'
)else
:print
('case3'
)
break
#終止所在的loop
continue
#跳出本次迴圈，繼續執行下次迴圈
count =
0while count <9:
print
(count)
count = count +
1else
:print
('end'
)#while結束時執行else
元素遍歷迭代
for iterating_var in sequence:
statements(s)
#basic grammar, interating_var將遍歷sequence中所有元素
for letter in
'python'
:# 第乙個例項
print
(letter)
fruits =
['banana',,
'mango'
]for fruit in fruits:
# 第二個例項
print
(fruit)
fruits =
['banana',,
'mango'
]print
(len
(fruits)
)print
(range
(len
(fruits)))
for index in
range
(len
(fruits)):
#range(3) equals to range(0,3)
print
('fruit'
+str
(index)
, fruits[index]
)#equal expression
for index in
range(0
,3):
print
('fruit'
, index, fruits[index]
)
def functionname( parameters ): #standard form
function_suite
return [expression]
def
printme
(astring)
:print
(astring)
return
printme(
'call function printme'
)
there are different type of parameter type.1個python module就是乙個py檔案；
模組能定義函式，類和變數，模組裡也能包含可執行的**。
模組的匯入：import module1 or from module1 import *
呼叫模組中的函式：模組名.函式名
str1 =
input
("請輸入："
)print
("你輸入的內容是: "
, str1)
fo =
open
('test_data.txt'
,'w'
)print
(fo.name)
fo.write(
'the_first_element'
)fo.close(
)fo =
open
('test_data_1.txt'
,'r+'
)str1 = fo.read(10)
str2 = fo.readline(
)fo.close(
)print
(str1)
print
(str2)
class
employee
: empcount =
0def
__init__
(self, name, salary)
: self.name = name
self.salary = salary
employee.empcount +=
1def
display_count
(self)
:print
('total employee number:'
, employee.empcount)
defdisplay_employee
(self)
:print
('total employee number:'
)print
('name:'
, self.name,
'salary:'
, self.salary)
emp1 = employee(
'ali',10
)emp2 = employee(
'cat',20
)emp1.display_count(
)emp1.display_employee(
)
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