如何使用替换方法替换句子中的第二个“是”

Question

strring ="My name is David and I live is India" # correct the grammer using find and replace method
new_str=strring.find("is")  # find the index of first "is"
print(new_str)
fnl_str=strring.replace("is","in")  # replace "is" with "in" ( My name is David and I live in India )
print(fnl_str)

Answer 1

也许str.rpartition() 在这里解决了这个问题，虽然不是一个通用的解决方案：

strring = "My name is David and I live is India"

first, sep, last = strring.rpartition('is')
print(first + 'in' + last)
# My name is David and I live in India

Answer 2

您可以.split() 字符串然后使用enumerate 创建包含单词is 的items 的索引列表。然后您可以获取该列表中的第二个索引并使用该index 将项目更改为in。然后使用' '.join() 将其重新组合在一起

s = "My name is David and I live is India"
s = s.split()
loc = []
for idx, item in enumerate(s):
    if item == 'is':
        loc.append(idx)

s[loc[1]] = 'in'

print(' '.join(s))

My name is David and I live in India