为什么python脚本运行但屏幕上什么都没有显示

Question

我是python编程的初学者，但是我现在面临的挑战是，无论何时我运行的脚本都包含屏幕上没有显示的功能。

示例如下代码：

def add(a,b):
         print "Adding %d + %d" %(a, b)
         return a +b

def subtract(a, b):
         print "Subtracting %d - %d"%(a, b)
         return a-b

def multiply(a, b):
         print "Multiplying %d * %d" %(a, b)
         return a * b

def divide(a, b):
         print "Dividing %d / %d" %(a, b)
         return a / b


         print "Lets do some math with just functions!"

         age = add(30,5)
         height = subtract(78, 4)
         weight = multiply(90, 2)
         iq = divide(100, 2)


         print "Age: %d, Height: %d, Weight: %d, IQ: %d"%(age,height,weight)

  # A puzzle for the extra credit, type it in anyway.
  print "Here is a puzzle."

         what = add(age, subtract(height, multiply(weight, divide(iq, 2))))

         print "That becomes: ", what, "Can you do it by hand?"[enter image description here][1]

Answer 1

缩进在Python中非常重要（也很遗憾看到IQ设置为50）

def add(a,b):
         print "Adding %d + %d" % (a, b)
         return a + b

def subtract(a, b):
         print "Subtracting %d - %d" % (a, b)
         return a - b

def multiply(a, b):
         print "Multiplying %d * %d" % (a, b)
         return a * b

def divide(a, b):
         print "Dividing %d / %d" % (a, b)
         return a / b

print "Lets do some math with just functions!"

age = add(30,5)
height = subtract(78, 4)
weight = multiply(90, 2)
iq = divide(100, 2)

print "Age: %d, Height: %d, Weight: %d, IQ: %d" % (age, height, weight, iq)

# A puzzle for the extra credit, type it in anyway.
print "Here is a puzzle."

what = add(age, subtract(height, multiply(weight, divide(iq, 2))))

print "That becomes: ", what, "Can you do it by hand?"

Answer 2

您的缩进全部搞砸了。 在Python中，缩进是告诉解释器代码应该在哪里的意思，例如，它说出一段代码是否应该在函数内部。 我也相信您的编辑器有一个奇怪的问题。 由于这是“学习Python的艰难方式”，因此您可能希望像作者在本书开始时所说的那样设置编辑器。 如果有任何遗漏，请发表评论，我将更新答案！

def add(a, b):
    print "ADDING %d + %d" % (a, b)
    return a + b

def subtract(a, b):
    print "SUBTRACTING %d - %d" % (a, b)
    return a - b

def multiply(a, b):
    print "MULTIPLYING %d * %d" % (a, b)
    return a * b

def divide(a, b):
    print "DIVIDING %d / %d" % (a, b)
    return a / b


print "Let's do some math with just functions!"

age = add(30, 5)
height = subtract(78, 4)
weight = multiply(90, 2)
iq = divide(100, 2)

print "Age: %d, Height: %d, Weight: %d, IQ: %d" % (age, height, weight, iq)


# A puzzle for the extra credit, type it in anyway.
print "Here is a puzzle."

what = add(age, subtract(height, multiply(weight, divide(iq, 2))))

print "That becomes: ", what, "Can you do it by hand?"