找不到变量名

debugcn 发表于 Dev

伊山

因此，我创建了一个程序，该程序将字符串值分配给变量。

这是代码

print("I have information for the following planets:\n");
print("   1. Venus   2. Mars    3. Jupiter");
print("   4. Saturn  5. Uranus  6. Neptune\n");
 
weight = input("Enter your weight: ");
planet = input("Enter planet number: "); 
# Write an if statement below:
if planet == 1:
  planet_name = 'Venus';
  weight = weight * 0.91;
elif planet == 2:
  planet_name = 'Mars';
  weight = weight * 0.38;
elif planet == 3:
  planet_name = 'Jupiter';
  weight = weight * 2.34;
elif planet == 4:
  planet_name = 'Saturn';
  weight = weight * 1.06;
elif planet == 5:
  planet_name = 'Uranus';
  weight = weight * 0.92;
elif planet == 6:
  planet_name = 'Neptune';
  weight = weight * 1.19;
else:
  print("Planet Not Found");
print("Your weight on " + planet_name + " is: " + weight + "kg");

因此，当我尝试运行该程序时，它说planet_name未找到并且还会打印else语句

这是有错误的输出

I have information for the following planets:

   1. Venus   2. Mars    3. Jupiter
   4. Saturn  5. Uranus  6. Neptune

Enter your weight: 55
Enter planet number: 6
Planet Not Found
Traceback (most recent call last):
  File "/data/data/com.termux/files/home/python/planet.py", line 28, in <module>
    print("Your weight on " + planet_name + " is: " + weight + "kg");
NameError: name 'planet_name' is not defined

我无法找到造成问题的原因。

容克拉特

首先，由于您使用的是python，因此不必;在每个语句的末尾添加。

现在，默认情况下，doinput('')返回string。你必须将类型更改为float用于weight与int供planet

print("I have information for the following planets:\n")
print("   1. Venus   2. Mars    3. Jupiter")
print("   4. Saturn  5. Uranus  6. Neptune\n")
 
weight = float(input("Enter your weight: "))
planet = int(input("Enter planet number: "))
# Write an if statement below:
if planet == 1:
  planet_name = 'Venus'
  weight = weight * 0.91
elif planet == 2:
  planet_name = 'Mars'
  weight = weight * 0.38
elif planet == 3:
  planet_name = 'Jupiter'
  weight = weight * 2.34
elif planet == 4:
  planet_name = 'Saturn'
  weight = weight * 1.06
elif planet == 5:
  planet_name = 'Uranus'
  weight = weight * 0.92
elif planet == 6:
  planet_name = 'Neptune'
  weight = weight * 1.19
else:
  print("Planet Not Found")
print("Your weight on " + planet_name + " is: " + str(weight) + "kg")

在最后一条print语句中，您必须将weightback的类型转换为string以打印出该语句

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