{"kind":"task","effective_mode":"full","benchmark":{"kind":"benchmark","effective_mode":"full","slug":"ds-1000","formal_name":"DS-1000","introduction":"DS-1000 builds 1,000 data-science problems from real StackOverflow questions across seven libraries including NumPy, Pandas and Matplotlib. The problems are perturbed so that recalling the original answer does not solve them.","introduction_ja":"","introduction_en":"","category":"Category not supplied","task_count":null,"acquisition_status":"Acquisition status not supplied","official_url":"https://ds1000-code-gen.github.io/","indexing_mode":"index","profile":{"resources":[],"task_format":"","scoring":"","metric":"","size":"","answer_access":"","license":"","citation":"","maintainer":"","released":"","why_hard":"","related":[],"history":"","construction":"","limitations":"","saturation":"","scores":[]}},"task_id":"eb77898e-b456-59ab-a9c7-3a47f5acb122","task_key":"default--test--246","task_revision_id":"1","upstream_id":"246","short_description":"I have a pandas series which values are numpy array. For simplicity, say","config":"default","split":"test","body":"{\"library\":\"Pandas\",\"prompt\":\"Problem:\\n\\n\\nI have a pandas series which values are numpy array. For simplicity, say\\n\\n\\n\\n\\n    series = pd.Series([np.array([1,2,3,4]), np.array([5,6,7,8]), np.array([9,10,11,12])], index=['file1', 'file2', 'file3'])\\n\\n\\nfile1       [1, 2, 3, 4]\\nfile2       [5, 6, 7, 8]\\nfile3    [9, 10, 11, 12]\\n\\n\\nHow can I expand it to a dataframe of the form df_concatenated:\\n       0   1   2   3\\nfile1  1   2   3   4\\nfile2  5   6   7   8\\nfile3  9  10  11  12\\n\\n\\nA:\\n<code>\\nimport pandas as pd\\nimport numpy as np\\n\\n\\nseries = pd.Series([np.array([1,2,3,4]), np.array([5,6,7,8]), np.array([9,10,11,12])], index=['file1', 'file2', 'file3'])\\n</code>\\ndf = ... # put solution in this variable\\nBEGIN SOLUTION\\n<code>\\n\"}","display_format":"code","language":"","answer_status":"published","assets":[],"source_url":"https://ds1000-code-gen.github.io/","history":"initial import","indexing_mode":"index","subproblems":[],"grids":[]}