Question

我是使用Python进行编程的新手（以及一般的编码），并且想要一些关于小型＆＃34; helloworld＆＃34;的帮助。项目

这是我目前的进展：

    #meet and greet program in python
print('Hello, nice to meet you')
username = input('Please enter your name: ')
print('Nice to meet you', username)
byear = input('What year were you born? :')
print('So you were born in the year', byear, '?' )
information = input('Is this information is correct? :')
if information == ('Yes') :
    print('Ok')
currentyr = input('Please enter the current year:')
print('So that means you are', currentyr - byear,'years old. Right?')

我遇到的麻烦是在最后一行，我希望通过从当前年份减去用户的出生年份（按输入）来查找用户的当前大致年龄（也可以通过输入 - 不确定如何导入当前年份的详细信息。）

这可以在最后一行的中间找到：

，currentyr - byear，

如果有人可以请我解释如何从其他输入变量（byear）中减去此输入变量（currentyr）以达到用户的大致年龄。

提前致谢。

Answer 1

使用转化为int：

print('So that means you are', int(currentyr) - int(byear),'years old. Right?')

使用input()从命令行获取变量时，您将获得字符串。您不能将值减去字符串。 int()从字符串中生成整数。

Answer 2

你不能在两个字符串中进行减法。您必须显式地将变量强制转换为整数。使用此表单2017.01.27 10:36:42 INFO app[][o.s.a.AppFileSystem] Cleaning or creating temp directory /opt/sonar/temp 2017.01.27 10:36:42 INFO app[][o.s.p.m.JavaProcessLauncher] Launch process[es]: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.121 0.b13.29.amzn1.x86_64/jre/bin/java -Djava.awt.headless=true -Xmx1G -Xms256m -Xss256k -Djna.nosys=true -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+HeapDumpOnOutOfMemoryError -Djava.io.tmpdir=/opt/sonar/temp -javaagent:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.121-0.b13.29.amzn1.x86_64/jre/lib/management-agent.jar -cp ./lib/common/*:./lib/search/* org.sonar.search.SearchServer /opt/sonar/temp/sq-process7514074371677370036properties 2017.01.27 10:36:51 INFO app[][o.s.p.m.Monitor] Process[es] is up 2017.01.27 10:36:51 INFO app[][o.s.p.m.JavaProcessLauncher] Launch process[web]: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.121-0.b13.29.amzn1.x86_64/jre/bin/java -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Djruby.management.enabled=false -Djruby.compile.invokedynamic=false -Xmx512m -Xms128m -XX:+HeapDumpOnOutOfMemoryError -Djava.io.tmpdir=/opt/sonar/temp -javaagent:/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.121-0.b13.29.amzn1.x86_64/jre/lib/management-agent.jar -cp ./lib/common/*:./lib/server/*:/opt/sonar/lib/jdbc/postgresql/postgresql-9.4.1209.jre7.jar org.sonar.server.app.WebServer /opt/sonar/temp/sq-process6553321235832962376properties 2017.01.27 10:36:54 INFO app[][o.s.p.m.Monitor] Process[es] is stopping 2017.01.27 10:36:54 ERROR app[][o.s.p.m.Monitor] Process[web] failed to start 2017.01.27 10:36:54 INFO app[][o.s.p.m.Monitor] Process[es] is stopped <-- Wrapper Stopped将字符串转换为整数。

此代码可以使用。

int(variable)

Answer 3

#meet and greet program in python print('Hello, nice to meet you') username = input('Please enter your name: ') print('Nice to meet you', username) byear = int(input('What year were you born? :')) print('So you were born in the year', byear, '?' ) information = input('Is this information is correct? :') if information == ('Yes') : print('Ok') currentyr = int(input('Please enter the current year:')) print('So that means you are', currentyr - byear,'years old. Right?')是Python标准内置函数，用于将字符串转换为整数值。您可以使用包含数字作为参数的字符串来调用它，并返回转换为实际整数的数字：

int()

以上打印2。

这是一个用于计算年龄的简单代码：

print (int("1")+1)

Answer 4

int（）：此函数将任何数据类型转换为整数。因此，在本示例中，我们将首先使用字符串输入，然后使用int（）函数将其转换为数字。

num1 = input("Please enter first Number:")

num2 = input("Please enter second Number:")

 print(f'Output After Subtraction: {int(num2) - int(num1)}')

如何从Python 3

4 个答案: