Creating a new pandas Dataframe from CSV file with no header

Question

I am trying to create a new dataframe from csv:

frame = DataFrame(data=pd.read_csv(path))

the result is correct except that the first line becomes the columns:

so I add columns to the dtaframe:

columns = ['person-id','time-stamp','loc-id']
frame = DataFrame(data=pd.read_csv(path),columns=columns)

then it goes wrong:the dataframe is all nan

this confuses me,can anyone tell me what is going on with it?

Answer 1

您不需要DataFrame构造函数，因为read_csv输出显然是DataFrame （如果不使用squeeze=True ，则使用Series ）：

frame=pd.read_csv(path)

Answer 2

You need to tell read_csv() that your input has no column headers; by the time you give Dataframe the column names, it's too late. Try this:

columns = ['person-id','time-stamp','loc-id']    
frame = pd.read_csv(path, names=columns)