python 基础之循环
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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
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