{"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":"44844e55-0559-562f-a09e-b46e2d0c4bb3","task_key":"default--test--254","task_revision_id":"1","upstream_id":"254","short_description":"I have a dataframe with one of its column having a list at each index. I want to…","config":"default","split":"test","body":"{\"library\":\"Pandas\",\"prompt\":\"Problem:\\nI have a dataframe with one of its column having a list at each index. I want to concatenate these lists into one list. I am using \\nids = df.loc[0:index, 'User IDs'].values.tolist()\\n\\n\\nHowever, this results in \\n['[1,2,3,4......]'] which is a string. Somehow each value in my list column is type str. I have tried converting using list(), literal_eval() but it does not work. The list() converts each element within a list into a string e.g. from [12,13,14...] to ['['1'',','2',','1',',','3'......]'].\\nHow to concatenate pandas column with list values into one list? Kindly help out, I am banging my head on it for several hours. \\n\\n\\nA:\\n<code>\\nimport pandas as pd\\n\\n\\ndf = pd.DataFrame(dict(col1=[[1, 2, 3]] * 2))\\n</code>\\nresult = ... # 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":[]}