python 基础之循环

标签：特殊   png   strip   数字   nbsp   格式   字母   blog   2.x   

　　1.1 变量命令

　　　　nums_of_gf = 19

　　　　NumsOfAlexGf = 19

　　　　不能  .name-of-alex-gf =19

　　　　中间不能有加减号，空格

　　　　数字，特殊字符 不开头

　　　　关键字不能定义变量

　　　　只能以字母，下划线开头

　　1.2  input

　　　　python3.x input()

　　　　python2.x raw_input()

　　　　python2.x input() >输入是什么格式就输出什么格式

　　　　name = input("please input your name")

　　　　print ("your name is %s" % name)

　　　　如果输入是数字类型并且还要对数字操作，最好用ini强制转换

　　　　raw_input 输出的是字符串格式，需要转换成数字类型

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

name = raw_input("name:").strip() ## 去掉前后的空格，不能去掉中间的空格，但是也可以指定去什么,只能去前后的
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

循环 3次 猜数字

 while 多次嵌套，可以用tag 作为变量 判断

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 外面重新判断
   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

## 多层循环
for j in range(5):
   for i in range(10):
      if i<5:
         continue # i <5 就跳出本次循环
#     print (i) ## 5 ,6 ,7 ,8 ,9
      # if i > 8:
      #  break
      # print (i) ## 5 ,6 ,7 8
      if j>3:
         break #跳出本层的循环
      print (i)   ##5，6，，7，8

python 基础之循环

标签：特殊   png   strip   数字   nbsp   格式   字母   blog   2.x   

原文地址：http://www.cnblogs.com/guazhang/p/7360040.html