Python中条件语句、循环语句和pass语句的使用示例

apple = "good"
 
if apple == "good":
    print("apple is {}".format(apple))
 
if apple == "bad":
    print("apple is {}".format(apple))
    print("需要联系商家换一个")

apple = "bad"
 
if apple == "good":
    print("apple is {}".format(apple))
else:
    print("apple is {}".format(apple))
    print("需要联系商家换一个")

score = 80
 
if score < 60:
    print("score = {}".format(score), " 为D级")
elif 60 <= score <= 74:
    print("score = {}".format(score), " 为C级")
elif 75 <= score <= 89:
    print("score = {}".format(score), " 为B级")
else:
    print("score = {}".format(score), " 为A级")

score = 80
 
if score < 75:
    if score >= 60:
        print("score = {}".format(score), " 为C级")
    else:
        print("score = {}".format(score), " 为D级")
else:
    if score <= 89:
        print("score = {}".format(score), " 为B级")
    else:
        print("score = {}".format(score), " 为A级")

total = 0
 
for i in range(1, 101):  # range(1， 101)的取值为1~100
    total += i
print("总和为：{}".format(total))

numList = [2, 4, 6, 8, 10, 11, 13, 15]
num = 10
for i in numList:
    if num == i:
        print("num 在 numList里面")
        break
    else:
        print("num 不在 numList里面")

numList = [2, 4, 6, 8, 10, 11, 13, 15]
num = 10
for i in numList:
    if num == i:
        print("num 在 numList里面")
        break
else:
    print("num 不在 numList里面")

total = 0
index = 1
 
while 1:
    if index > 100:
        break
    total += index
    index += 1
 
print("total = {}".format(total))

numList = [2, 4, 6, 8, 10, 11, 13, 15]
num = 15
index = 0
flag = False
 
while index < len(numList):
    if num == numList[index]:
        flag = True
        break
    index += 1
 
if flag:
    print("num 在 numList里面")
else:
    print("num 不在 numList里面")

sex = "男"
 
if sex == "男":
    print("他是男的")
else:
    pass