python json数组长度_在Python中从JSON数组中挑选数据对象

我有这个数据对象,我想知道如何才能选择称为提交(或项目)的子对象.我尝试过all_commits = all_data [‘commits’],但是python强迫我给它一个整数,而不是字符串.思考?

[

{

"commits": [

{

"project_id": "1",

"commit_title": "commit 1",

"date": "date 1",

"markdown": "markdown 1"

},

{

"project_id": "1",

"commit_title": "commit 2",

"date": "date 2",

"markdown": "markdown 2"

},

{

"project_id": "1",

"commit_title": "commit 3",

"date": "date 3",

"markdown": "markdown 3"

},

{

"project_id": "1",

"commit_title": "commit 4",

"date": "date 4",

"markdown": "markdown 4"

},

{

"project_id": "2",

"commit_title": "commit 5",

"date": "date 5",

"markdown": "markdown 5"

},

{

"project_id": "2",

"commit_title": "commit 6",

"date": "date 6",

"markdown": "markdown 6"

}

]

},

{

"projects": [

{

"id": 1,

"project_name": "GreenGlass for Groups",

"description": "Support group projects for retention agreements"

},

{

"id": 2,

"project_name": "Zumo Redesign",

"description": "New eda theme-based design"

}

]

}

]