比較運(yùn)算符

邏輯運(yùn)算符

## 比較運(yùn)算符
a, b, c = 10, 3, 7
print(a >= b) #True
print(a > b) #True
print(a < b) #True
print(a <= b) #True
print(a == b) # False
print(a != b) # False
# 邏輯運(yùn)算符  與 或 非
print((a > c) and (a > b)) # True    &&
print((a > c) and (a < b)) # False

print((a > c) or (a > b)) # True   ||
print((a < c) or (a > b)) # True
print((a < c) or (a < b)) # False

print(not (a < c)) # True   !

程序執(zhí)行結(jié)構(gòu)

• 順序結(jié)構(gòu)
• 分支結(jié)構(gòu)
• 循環(huán)結(jié)構(gòu)

分支結(jié)構(gòu)(條件語句)

if語句

age = int(input("請輸入您的年齡"))
# TypeError: '>=' not supported between instances of 'str' and 'int'

if age >= 18 and age <=60:
    print("恭喜你成年了, 可以去網(wǎng)吧了")
    print("恭喜你成年了, 還不趕快行動")
elif age > 60 and age <=150:
    print("退休啦")
elif age >=0  and age <=18:
    print("你還是個寶寶")
else:
    print("輸入數(shù)據(jù)有誤")

作業(yè)

BMI計算器
計算公式為：BMI=體重÷身高^2。（體重單位：千克；身高單位：米。）

猜拳游戲

# 猜拳游戲
from random import randint
computer = randint(1, 3)  # [1, 3] 左閉右閉
# print(computer)
player = int(input("請出拳: ?頭（1）剪?（2）布（3）"))
if (player==1 and computer==2)or(player==2 and computer==3)or(player==3 and computer==1):
    print("玩家勝利啦")
elif player==computer:
    print("平局")
else:
    print("你真菜, 我贏了")

循環(huán)

# while
# while 條件:
#     循環(huán)體
i = 1
mySum = 0
while i <= 100:
    print(i, end="\t")
    mySum += i
    i+=1
print()
print(mySum)
# break 跳出本層循環(huán)
# 累加和達(dá)到大于1000停止
i = 1
mySum = 0
while i <= 100:
    if mySum > 1000:
        break
    mySum += i
    i+=1
print()
print("mySum = ", mySum)

# continue 結(jié)束本次循環(huán)執(zhí)行下一次循環(huán)
# 1~100之間所有奇數(shù)的累加和
i = 1
mySum = 0
while i <= 100:
    if i%2 == 0:
        i+=1
        continue
    mySum += i
    i+=1
print()
print("mySum = ", mySum)

for 循環(huán)

# for循環(huán)
# for 臨時變量 in 可迭對象:
#     循環(huán)體
# range(起始, 終止, 步長)  左閉右開區(qū)間 步長不能為小數(shù)
# for i in range(10):
# for i in range(1, 101):
# for i in range(1, 101, 10):
mySum = 0
for i in range(1, 101):
    mySum +=i
print("mySum = ", mySum)
# # break 跳出本層循環(huán)
# # 累加和達(dá)到大于1000停止
mySum = 0
for i in range(1, 101):
    if mySum > 1000:
        break
    mySum +=i
print("mySum = ", mySum)
# # continue 結(jié)束本次循環(huán)執(zhí)行下一次循環(huán)
# # 1~100之間所有奇數(shù)的累加和

mySum = 0
for i in range(1, 101):
    if i %2 == 0:
        continue
    mySum +=i
print("mySum = ", mySum)