如何在Python中使用find()函数查找字符串中所有的单词

s = "Welcome to pidancode.com, the best place to learn Python programming."

# 将标点符号替换为空格
for c in "!@#$%^&*()_+-={}[]|\:;'\"<>,.?/":
    s = s.replace(c, " ")

# 将字符串转换为小写，以便忽略大小写
s = s.lower()

# 按空格分割字符串，并去除空单词
words = [w for w in s.split() if w]

# 查找所有单词的位置
for word in words:
    start = -1
    while True:
        start = s.find(word, start + 1)
        if start == -1:
            break
        end = start + len(word)
        print("单词 %s 的位置为 [%d, %d)" % (word, start, end))