擅长:python、mysql、java
<p>就这么做吧:</p>
<pre><code>sentence = input("Enter a sentence ").lstrip() # remove trailing whitespaces
# check if first character is uppercase
if not sentence[0].isupper():
print("Sentence does not start with uppercase character")
# correct the sentence
sentence = sentence[0].upper() + sentence[1:]
# check if last character is a punctuation
# (feel free to add other punctuations)
if sentence[-1] not in (['.']):
print("Sentence does not end with punctuation character")
# correct the sentence
sentence += '.'
#finally print the correct sentence
print(sentence)
</code></pre>