python 基礎之迴圈

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　　1.1 變數命令

　　　　nums_of_gf = 19

　　　　NumsOfAlexGf = 19

　　　　不能  .name-of-alex-gf =19

　　　　中間不能有加減號，空格

　　　　數字，特殊字元 不開頭

　　　　關鍵字不能定義變數

　　　　只能以字母，底線開頭

　

　　1.2  input

　　　　python3.x input()

　　　　python2.x raw_input()

　　　　python2.x input() >輸入是什麼格式就輸出什麼格式

　　　　name = input("please input your name")

　　　　print ("your name is %s" % name)

　　　　如果輸入是數字類型並且還要對數字操作，最好用ini強制轉換

　　　　raw_input 輸出的是字串格式，需要轉換成數字類型

　　　　input_num = int(raw_inout ("please input your num:"))　

 

 

name = raw_input("name:").strip() ## 去掉前後的空格，不能去掉中間的空格，但是也可以指定去什麼,只能去前後的
age = raw_input("age:")
job = raw_input("job:")
print ("Info1 of []:" + name +"\nName:[]" + name +"\nAge:[]" + age +"\nJob:[]" + job)
print ("Info2 of %s:\nName:%s\nAge:%s\nJob:%s" %(name,name,age,job))
##段落
msg = ‘‘‘
Info3 of %s:
   Name:%s
   Age:%s
   job:%s
‘‘‘ %(name,name,age,job)
print (msg)

 

 

 

 

 

　　1.3  if ...else

 

 

 

迴圈 3次 猜數字

 while 多次嵌套，可以用tag 作為變數 判斷

tag = True

while tag:

　　......

　　......

　　tag =False

　　countinue

 

 

luck_num = 6
time = 0
num = None
while luck_num != num :
   num = int(raw_input("please input your num:"))
   if luck_num > num:
      print ("your num is less than ")
   elif luck_num < num:
      print ("your num is more than")
   time += 1
   if time > 3:
      print ("your guess time more than 3 time")
      break
else:
   print ("ok")

 

luck_num = 6
time = 0
num = None
while luck_num != num and time <3:
   num = int(raw_input("please input your num:"))
   if luck_num > num:
      print ("your num is less than ")
   elif luck_num < num:
      print ("your num is more than")
   time += 1
#  if time > 3:
#     print ("your guess time more than 3 time")
#     break
else:
   if luck_num == num:
      print ("ok")
   else:
      print ("too much retrys")

　　　

 

luck_num = 6
time = 0
num = None
while luck_num != num and time <3:
   num = int(raw_input("please input your num:"))
   if luck_num > num:
      print ("your num is less than ")
   elif luck_num < num:
      print ("your num is more than")
   time += 1
#  if time > 3:
#     print ("your guess time more than 3 time")
#     break

if luck_num == num:   ## 可以在while 外面重新判斷
   print ("ok")
else:
   print ("too much retrys")

 

luck_num = 6
time = 0
num = None
while time <3:
   num = int(raw_input("please input your num:"))
   if luck_num > num:
      print ("your num is less than ")
   elif luck_num < num:
      print ("your num is more than")
   else:
      print ("ok")
      break
   time += 1
#  if time > 3:
#     print ("your guess time more than 3 time")
#     break
else:
   print ("too much retrys")

 

 

 

 

 

 

for i in range(10):
   print i

0
1
2
3
4
5
6
7
8
9

 

## 多層循環
for j in range(5):
   for i in range(10):
      if i<5:
         continue # i <5 就跳出本次循環
#     print (i) ## 5 ,6 ,7 ,8 ,9
      # if i > 8:
      #  break
      # print (i) ## 5 ,6 ,7 8
      if j>3:
         break #跳出本層的循環
      print (i)   ##5，6，，7，8

 

python 基礎之迴圈