A, read_table / read_csv common function parameters
1, path: string indicating the file system location, url type or file objects
2, sep, or delimiter: used to separate each character sequence line fields or regular expressions
3, header: as a line number column name, the default is 0 (first line), if the name is not listed, it should be specified as None
4, names: a list of results with column names, and header = None.
5, index_col: as a result rows indexed column number or name can be a single name / number, may be a layered index.
6, SkipRows : starting from the beginning of the file, you need to skip a list of the number of lines or line number.
7, na_values: sequence of values replaced with NA needs.
Missing values displayed by default (represented by NAN) is NULL
na_nalues specified missing values are displayed (indicated by NAN) is NULL
A dictionary form, na_values can specify different column missing values are displayed at different values
8, nrows: block read file
max_rows: before you try large files, we can first adjust the display settings pandas, making it more compact
If the read points to a small part of the line, may indicate nrows:
