grok 学习：python 课程，向后打印

Question

One of the questions on the grok learning python course is, "Write a program that reads in a line of text and prints out the line of text backwards."I wrote:

word = input('Line: ')
for i in range(len(word)):
  i = (0 - 1 - i)
  print(word[i],end = "")

This gives any entered text back to the user backwards but when I submit it it says "Your output is missing a trailing newline character." Does this mean that the answer is incorrect because any new print statements will print text on the same line as the entered word?

Answer 1

What I would do is store the reverse of the word in another variable new_word and then print that after the for loop.

word = input('Line: ')
new_word = ""

for i in range(len(word)):
    i = (0 - 1 - i)
    new_word += word[i]

  print(new_word)

Answer 2

Obligatory one-liner:

>>> "This is my string in reverse"[::-1]
'esrever ni gnirts ym si sihT'

Including an input prompt:

>>> input('Line: ')[::-1]
Line: this is my stuff
'ffuts ym si siht'

Answer 3

There are several ways to make Python speak backwards, and all of them work, and I hope they help you.

Here are some solutions that Grok Learning itself recommends:

• Sample solution #1:

text = input('Line: ')
last_index = len(text) - 1
backwards_text = ''
for i in range(last_index, -1, -1):
    backwards_text = backwards_text + text[i]
print(backwards_text)

• Sample solution #2:

line = input('Line: ')
for i in range(len(line)-1, -1, -1):
  print(line[i], end='')
print()

These both work, and they both use a slight different way on how to print backwards, but they both use a for loop, and I hope both of these help you, and I hope you find this helpful.

Answer 4

y = input("Line: ")

print(y[::-1])

works like a beauty