根据字典值打印单数/复数答案

【问题标题】：Printing singular/plural depending on dictionary value根据字典值打印单数/复数
【发布时间】：2020-10-15 23:41:58
【问题描述】：

favorite_languages = {'jen': ['python', 'ruby'], 'sarah': ['c'], 'edward': ['ruby', 'go'],
                  'phil': ['python', 'haskell'],}


for name, languages in favorite_languages.items():

   print("\n" + name.title() + "'s favorite languages are:")
   for language in languages:print("\t" + language.title())

output:Jen's favorite languages are:
Python
Ruby

Sarah's favorite languages are:
C
enter code here

Edward's favorite languages are:
Ruby
Go

Phil's favorite languages are:
Python
Haskell

我想显示“莎拉最喜欢的语言是”而不是“是”。无法弄清楚如何编写 if 语句来做到这一点。

【问题讨论】：

标签： python python-3.x dictionary if-statement

【解决方案1】：

尝试以下方法：

print("\n" + name.title() + "'s favorite language" + 
      ("s are:" if len(languages) > 1 else " is:"))

然后应该打印：

Jen's favorite languages are:
    Python
    Ruby

Sarah's favorite language is:
    C

Edward's favorite languages are:
    Ruby
    Go

Phil's favorite languages are:
    Python
    Haskell

与您的问题没有直接关系，但不赞成使用 + 连接字符串。有关最佳做法，请参阅 this question。

【讨论】：

【解决方案2】：

当前/最佳方式

for name, languages in favorite_languages.items():
  print()
  if len(languages) > 1:
    print(f"{name}'s favoutire language are")

else:
    print(f'{name} language is')


for language in languages:
     print(language)

【讨论】：