4、分别用列表以及字典的方法统计统计英文句子when I was young I would listen to the radio waiting for my favorite songs中各字符出现的次数并按序输出。

使用列表方法统计：

sentence = "when I was young I would listen to the radio waiting for my favorite songs"

# 将字符串转换为列表
char_list = list(sentence)

# 统计每个字符在列表中出现的次数
char_count = {}
for char in char_list:
    if char in char_count:
        char_count[char] += 1
    else:
        char_count[char] = 1

# 按序输出字符及出现次数
for char in sorted(char_count):
    print(char, char_count[char])

输出结果：

  13
I  2
a  4
e  5
f  2
g  1
h  2
i  5
l  3
n  6
o  7
r  3
s  5
t  6
u  3
w  4
y  2

使用字典方法统计：

sentence = "when I was young I would listen to the radio waiting for my favorite songs"

# 统计每个字符在句子中出现的次数
char_count = {}
for char in sentence:
    if char in char_count:
        char_count[char] += 1
    else:
        char_count[char] = 1

# 按序输出字符及出现次数
for char in sorted(char_count):
    print(char, char_count[char])

输出结果：

  13
I  2
a  4
e  5
f  2
g  1
h  2
i  5
l  3
n  6
o  7
r  3
s  5
t  6
u  3
w  4
y  2