我如何只打印非零硬币的价值？答案

【问题标题】：How do I only print out the value of coins that are not zero?我如何只打印非零硬币的价值？
【发布时间】：2015-10-15 06:54:30
【问题描述】：

现在，如果没有硬币或便士，我的代码会打印出“0 dimes”或“0 pennies”，我需要知道如何制作它，以便如果特定硬币为 0，则不会打印任何内容为了那枚硬币。

  #Asks user how much change they are trying to give, returns the coins to make that change

  coin = int(input("How much change are you tring to give (in cents)? "))


  while coin >= 25: 

      quarters = coin // 25
      coin = coin % 25

      if coin >= 10:
          dimes = coin // 10
          coin = coin % 10

      if coin >= 5:
          nickels = coin // 5
          coin = coin % 5

      pennies = coin // 1
      coin %= 1

      print ("You have ",quarters,"quarters", dimes, "dimes,",nickels,"nickels and ",pennies,"pennies.")

例如，如果找零是 1 个季度和 2 个镍币，它将打印：（您有 1 个季度，0 个硬币，2 个镍币和 0 个便士）

我需要它来打印（你有 1 个四分之一硬币和 2 个镍币）

【问题讨论】：

检查if whatever != 0:（或只是if whatever:）然后打印？
@jonrsharpe，为了防止多个打印语句创建多行，您可以 print('whatever', end="")

标签： python python-3.x if-statement while-loop printf

【解决方案1】：

这里的字符串连接是你的朋友！不要有一个非常大的打印声明，而是尝试这样的事情：

print_str = ''
if quarters > 0:
    print_str += 'You have ' + str(quarters) + ' quarters.'

然后，最后，打印你的 print_str。

请注意，您可能希望在字符串中包含换行符。 -- 我建议在这里阅读字符串：http://www.tutorialspoint.com/python/python_strings.htm

【讨论】：

print_str = 'You have ' 在 if 之外，否则如果没有宿舍，它不会打印“你有”

【解决方案2】：

让我们将硬币检查到您当前的代码中，并在我们进行时构建输出字符串。请注意，我们永远不会给多个五分钱。

# Asks user how much change they are trying to give, returns the coins to make that change

coin = int(input("How much change are you trying to give (in cents)? "))
change = ""

while coin >= 25:

    quarters = coin // 25
    coin = coin % 25
    if quarters > 0:
        change += str(quarters) + " quarters "

    if coin >= 10:
        dimes = coin // 10
        coin = coin % 10
        change += str(dimes) + " dimes "

    if coin >= 5:
        nickels = coin // 5
        coin = coin % 5
        change += str(nickels) + " nickel "

    pennies = coin // 1
    coin %= 1
    if pennies > 0:
        change += str(pennies) + " pennies "

    print (change)

【讨论】：