Question

我的Python课程中有一个作业。它说：

编写一个程序，要求用户输入一个人的年龄。该   程序应显示一条消息，指示该人是否是   婴儿，儿童，青少年或成人。以下是以下准则：


如果该人是1岁或以下，他或她是婴儿。

如果此人年龄超过1岁但未满13岁，则他或她是小孩。

如果该人年满13岁但不到20岁，则他或她是青少年。

如果此人年满20岁，则他或她是成年人。

这是我到目前为止所拥有的。我假设您使用if和else语句。

age = int(input('Please enter a persons age.'))
if age <= 1: print('The person is an infant.')
else: print('The person is not an infant.')
if age > 1 and age > 13: print('The person is a child.')
else: print ('The person is not an infant.')
if age <= 13 and age > 20: print('The person is a teenager.')
else: print ('The person is not a teenager.')
if age >=20: print ('The person is an adult.')

问题是，当我输入数字，例如数字＆＃39; 4＆＃39;时，程序运行如下：

The person is not an infant.
The person is not an infant.
The person is not a teenager.

这就是它给我读的全部内容。那么我该如何解决这个问题呢？因为我以为自己走在了正确的轨道上。

Answer 1

使用术语if，elif和else：

查看链式if语句的使用

# ask user to input age
age = int(input('Please enter a persons age.'))

# if a person is 1 or younger
if age <= 1:
    print 'The person is an infant.'
# if a person is older than 1 but younger than 13
elif age > 1 and age < 13:
    print 'The person is a child.'
# if a person is at least 13, but less than 20
elif age >= 13 and age < 20:
    print 'The person is a teenager.'
else if age >= 20:
    print 'The person is an adult.'

看起来你应该从这个练习中学到两点。第一个是如何将if / elif / else语句链接在一起。这样做比单独评估每个条款更有效。如上所示，您可以使用＆＃39; if＆＃39;在第一个声明中，＆＃39; elif＆＃39;在以下陈述中，＆＃39;否则＆＃39;在最后的声明中。

这对于错误检查也很有用。您可以执行以下操作：

# ask user to input age
age = int(input('Please enter a persons age.'))

# if a person is 1 or younger
if age <= 1:
    print 'The person is an infant.'
# if a person is older than 1 but younger than 13
elif age > 1 and age < 13:
    print 'The person is a child.'
# if a person is at least 13, but less than 20
elif age >= 13 and age < 20:
    print 'The person is a teenager.'
elif if age >= 20:
    print 'The person is an adult.'
else:
    print 'Check that your input is an integer and try again.'

第二个是＆lt; ＆GT;和＆lt; =＆gt; =。请注意，如果他们未满1岁，则该人将其分类为婴儿。这不包括年龄为1岁，仅包括尚未达到1岁的人，因此您将使用＆＃39;＆lt; 1＆＃39;获得长达364天的一切。

这与将某人至少归类为＆＃39; 13岁时少年。这意味着它们可以是13或更高，因此您将使用＆＃39;＆gt; = 13＆＃39;。

Answer 2

似乎你陷入了一个循环，你需要告诉程序要说什么，例如。如果年龄<= 1：打印（“你是个婴儿”）其他：打印（“你还是个孩子”）

Answer 3

# It will work In sha allah!
age = int(input('Please enter a persons age.'))

# if a person is 1 or younger
if age <= 1:
    print ("The person is an infant")
# if a person is older than 1 but younger or same as 13
elif age > 1 and age <= 13:
    print ("The person is a child")
# if a person is at least 13, but less than 20
elif age >= 13 and age < 20:
    print ("The person is a teenager")
elif  age >= 20:
    print ("The person is an adult")
else:
    print ("wrong age")

Answer 4

我希望这能解决您的问题

print "Enter Age"
age = input()
if age<1:
  print "he or she is an infant."
elif age>=1 and age<13:
  print "he or she is a child"
elif age>=13 and age<20:
  print "He or she is an adult"
elif age>=20:
  print "he or she is an adult"
else:
  print "adult"

Answer 5

for i in range(5):
    age = int(input('Please enter a persons age.'))
    if age <= 1:                  
        print(f'The person is an infant.')

    elif age > 1 and age < 13:
        print('The person is a child.')

    elif age >= 13 and age < 20:
        print('The person is a teenager.')

    elif age >= 20:
        print('The person is an adult.')

    else:
        print("wrong age")

如何使用if和else语句来实现Age Classifier程序

5 个答案: