打印用户输入的第一个字母的名称-Python

Question

letter = input("Enter a letter to show that particular country: ")
output_names = [name for name in Country if (name[0] in letter)]
print(output_names)

I have this and my .txt file is bit long and the error showing is- "IndexError: string index out of range". How can I make it work?

Answer 1

You can use a combination of factors to make a small edit to the list comprehension.

1. Empty things are falsey eg lists/dictionaries/empty strings

   bool('')

   Out[1]: False

   bool('a')

   Out[2]: True

2. The logical operator and will short circuit. That means in this case, if it sees something False on its first test, it will not attempt the subsequent tests.

Putting it together, we can avoid trying to index the empty string.

filtered = [item for item in my_list if item and item[0]]
                                     ^^^^^^^
                                     False for empty string

Answer 2

做就是了：

print [name for name in Country if name.lower().startswith(letter.lower())]