姜小白的python日记day2 变量和循环

变量和循环
变量是用来存储一个数据，以便于后续调用

变量定义规则
• 变量名只能是字母，数字或下划线的任意组合
• 变量名第一个字符不能是数字
• 以下关键字不能为变量名
• [‘and’,‘as’,‘assert’,‘break’,‘class’,‘def’,‘elif’,‘else’,‘except’,‘exec’,‘finally’,‘for’,‘from’,‘global’,‘if’,‘impot’,‘in’,‘is’,‘lambda’,‘not’, ‘or’,‘pass’,‘print’,‘raise’,‘return’,‘try’,‘while’,‘with’,‘yield’]

Python中变量名全大写表示是该变量是常量

字符集声明：# -- coding:utf-8 --
注释：
• 单行注释：#
• 多行注释：’’’

if判断
age_js = 26
guess_age = int(input(“Guess_age:”))
if guess_age == age_js:
print(“bingo”)
elif guess_age > age_js:
print(“guess smaller”)
else :
print(“guess bigger”)

while循环
age_js = 26
count = 0
while count < 3:
guess_age = int(input(“Guess_age:”))
if guess_age == age_js:
print(“bingo”)
break
elif guess_age > age_js:
print(“guess smaller”)
else:
print(“guess bigger”)
count +=1
if count == 3:
countine_confirm = input(“仍要继续尝试吗”)
if countine_confirm != ‘n’:
count = 0

for循环
for i in range(0,10,2):
print(“loop”,i)

age_js = 26
for i in range(3):
guess_age = int(input(“Guess_age:”))
if guess_age == age_js:
print(“bingo”)
break
elif guess_age > age_js:
print(“guess smaller”)
else:
print(“guess bigger”)
else:
print(“没有次数了！”)

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