python - 检查大小写和句号的程序

Question

我是一名初学者程序员。我正在尝试编写一个程序，该程序会询问一个句子，然后检查两件事。 1) 句子开头大写字母，2) 句末句号。我还希望它打印出一个句子，告诉用户他们的句子是否正确。例如:

输入一句话:Python很难。

您的句子不是以大写字母开头。

和

输入一句话:Python很难

你的句子结尾没有句号。

和

输入一句话:python很难

您的句子不是以大写字母开头，结尾也没有句号。

最后；

输入一个句子:Python 很难。

你的句子很完美。

但是，我被困住了，我所拥有的只是一团糟:

sentence = input("Sentence: ")
if sentence[0].isupper():
  print("")
if (sentence[0].isupper()) != sentence:
  print("Your sentence does not start with a capital letter.")
elif "." not in sentence:
  print("Your sentence does not end with a full stop.")
else:
  print("Your sentence is correctly formatted.")

任何帮助将不胜感激。

Answer 1

试试这个:

sentence = input('Sentence: ') # You should use raw_input if it is python 2.7
if not sentence[0].isupper() and sentence[-1] != '.': # You can check the last character using sentence[-1]
    # both the conditions are not satisfied
    print 'Your sentence does not start with a capital letter and has no full stop at the end.'
elif not sentence[0].isupper():
    # sentence does not start with a capital letter
    print 'Your sentence does not start with a capital letter.'
elif sentence[-1] != '.':
    # sentence does not end with a full stop
    print 'Your sentence does not end with a full stop.'
else:
    # sentence is perfect
    print 'Your sentence is perfect.'