Question

Python 3.5

这是我的代码：

str1 = input("Please enter a full sentence: ").lower()
print("Thank you, You entered:" , str1)

str2 = input("Now please enter a word included in your sentence in anyway you like: ").lower()

if str2 in str1:
    print("That word was found!")
else:
    print("Sorry, that word was not found")

实际上，它将搜索输入的单词（str2），如果在输入中找到它（str1（一个句子）），它将说“已找到单词”）。如果单词不在句子中，则会说“找不到单词”。

我想开发这个，所以当搜索和找到单词时，它会告诉用户句子（str1）中单词（str2）的索引位置。例如：如果我有句子（“我喜欢用Python编写代码”）并且我搜索单词（“代码”），那么程序应该说“在索引位置找到了这个单词：4”。

顺便说一句，代码不区分大小写，因为它使用.lower将所有单词转换为小写。

如果有人能就此提出一些建议，那将非常感激！

Answer 1

您可以用此替换if ... else：

try:
    print("That word was found at index %i!"% (str1.split().index(str2) + 1))
except ValueError:
    print("Sorry, that word was not found")

Answer 2

print("That word was found at index %i!"% (str1.split().index(str2)))

这将打印str1中第一次出现str2的索引完整的代码是：

str1 = input("Please enter a full sentence: ").lower()
print("Thank you, You entered:" , str1)

str2 = input("Now please enter a word included in your sentence in anyway you like: ").lower()

if str2 in str1:
    print("That word was found!")
    print("that word was found in index position: %i!"% (str1.split().index(str2)))

，str1.index（str2））
其他：打印（“抱歉，找不到该词”）

Answer 3

str2 = 'abcdefghijklmnopqrstuvwxyz'
str1 = 'z'
index = str2.find(str1)
if index != -1:
    print 'That word was found in index position:',index
else:
    print 'That word was not found'

这将在str2

中打印str1的索引

Answer 4

您可以使用split（）方法：在字符串值上调用它并返回字符串列表。然后使用index（）方法查找字符串的索引。

str1 = input("Please enter a full sentence: ").lower()
print("Thank you, You entered:" , str1)
str2 = input("Now please enter a word included in your sentence in anyway you like: ").lower()

if str2 in str1:
    a = str1.split() # you create a list
    # printing the word and index a.index(str2)
    print('The ', str2,' was find a the index ', a.index(str2)) 
    print("That word was found!")
else:
    print("Sorry, that word was not found")

字符串索引

4 个答案: