用python纠正英文中的错误，该怎么做呀？求朋友们告知
问题描述：
3、编写一段程序，实现纠正一段英文中的两种错误：（1）单独字母“I”误写为“i”的情况；（2）以及单词中间字母“i”误写为“I”的情况。运行结果如图3所示。
测试用短文：
i am a student. I am sIx years old. i like read book. I lIke play the piano.
I am a unIversity student. i major in Information management and informatIon system.
答
a = """i am a student. I am sIx years old. i like read book. I lIke play the piano.
I am a unIversity student. i major in Information management and informatIon system.
"""
b = list(a)
error1 = 0 # I误写为i的次数
error2 = 0 # i误写为I的次数
for index,c in enumerate(b):
if c == "i" and b[index + 1] == " ":# 如果是小写的字符,并且它的下一个是空格
b[index] = "I"
error1 += 1
elif c == "I" and b[index+1] != " ":
b[index] = "i"
error2 += 1
b = "".join(b)
print("原句子: ")
print(a)
print("修改后: ")
print(b)
print("I误写为i的情况有{}处; i误写为I的情况有{}处.".format(error1,error2))
结果:
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答
a='i am a student. I am sIx years old. i like read book. I lIke play the piano. \
I am a unIversity student. i major in Information management and informatIon system.'
b=a.replace('I','i').replace('i ','I ')
print(b)