Question

<<chunkid, echo = FALSE>>=
X = 2:10
summary(X)
@

目前打印出以下内容：

r = '{"available_sizes":[{"id":104682,"name":"40","preorder_only":false},{"id":104683,"name":"41","preorder_only":false},{"id":104684,"name":"42","preorder_only":false},{"id":104685,"name":"43","preorder_only":false},{"id":104687,"name":"45","preorder_only":false}]}'

data = json.loads(r)

for element in data: 
    for value in data['available_sizes']:
        print(value['name'])

我如何将此数据用作字符串？以下是所需的输出。

Answer 1

你最外面的循环是多余的，因为你只有一个密钥可以迭代。

对data进行迭代，将您的数字附加到列表中，然后在结尾处调用str.join以有效地将字符串连接在一起。

nums = []
for v in data['available_sizes']:
    nums.append(str(v['name']))  # v['name'] if it is already string

print(f'Available sizes are {', '.join(nums)}')

您可以使用列表推导重写循环 -

num_str = ', '.join([v['name'] for v in data['available_sizes']])
print(f'Available sizes are {num_str}')

有关JSON数据遍历的入门知识，我建议您查看this answer。

Answer 2

使用for-comprehension提取大小名称，然后使用str.join()添加逗号分隔符：

import json

r = '{"available_sizes":[{"id":104682,"name":"40","preorder_only":false},{"id":104683,"name":"41","preorder_only":false},{"id":104684,"name":"42","preorder_only":false},{"id":104685,"name":"43","preorder_only":false},{"id":104687,"name":"45","preorder_only":false}]}'
data = json.loads(r)

# Extract the size names from the list of available sizes
size_names = [size_entry["name"] for size_entry in data["available_sizes"]]

# Join the sizes names as strings using a comma separator and print
sizes_string = ", ".join(size_names)
print("Available sizes are: " + sizes_string)

Answer 3

做类似的事情这是你想要的输出

import json

 r = '{"available_sizes":[{"id":104682,"name":"40","preorder_only":false},{"id":104683,"name":"41","preorder_only":false},{"id":104684,"name":"42","preorder_only":false},{"id":104685,"name":"43","preorder_only":false},{"id":104687,"name":"45","preorder_only":false}]}'

data = json.loads(r)

var = []

for element in data: 
    for value in data['available_sizes']:
        var.append(value['name'])
print( 'Availble size are %s' %(', '.join(var)))

将JSON值转换为字符串

3 个答案: