任务：词频统计

字符串分隔 - split()

split() 方法语法：str.split(" ", num)
以 " " 为间隔，分割 num 次

text = 'I love Python and I also love Java'
word = text.split(" ")  # 拆分
diff_word = list(set(word))  # 去重

# 重置单词个数为0
count = []
for i in range(len(diff_word)):
    count.append(0)

# 遍历单词列表，统计各个单词的个数
for i in range(len(word)):
    for j in range(len(diff_word)):
        if diff_word[j] == word[i]:
            count[j] += 1
            
# 输出
for word_count in zip(diff_word, count):
    print(word_count)

输出结果：

('love', 2)
('and', 1)
('I', 2)
('Java', 1)
('also', 1)
('Python', 1)