csvm 0.0.2

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CSVM

CSVM is a file format that allows you to save multiple tables, add comments, and include metadata for both tables and columns

File format explanation

1. Transform a .csv into a .csvm

   We start with a .csv

   first_name,last_name,instrument
   Syd,Barret,"guitar, vocals"
   David,Gilmour,"guitar, vocals"
   Roger,Waters,"bass, vocals"
   Richard,Wright,"keyboards, vocals"
   Nick,Mason,drums
   

   To transform it into a .csvm you add table attributes. Tha available table attributes are:

   • [_columns_] to define the column names
   • [_data_] to define the tabular data
   • [_table_meta_.any_key.with_nested_keys] to add table metadata
   • [_columns_meta_.any_key.with_nested_keys] to add column metadata.

   For now we add the attributes _columns_ and _data

   [_columns_]
   first_name,last_name,instrument
   [_data_]
   Syd,Barret,"guitar, vocals"
   David,Gilmour,"guitar, vocals"
   Roger,Waters,"bass, vocals"
   Richard,Wright,"keyboards, vocals"
   Nick,Mason,drums
   

2. Add comments and blank lines

   Every line that starts with a # is ignored when parsing the file

   # Pink Floyd band members
   
   [_columns_]
   first_name,last_name,instrument
   
   [_data_]
   Syd,Barret,"guitar, vocals"
   David,Gilmour,"guitar, vocals"
   Roger,Waters,"bass, vocals"
   Richard,Wright,"keyboards, vocals"
   Nick,Mason,drums
   

3. Add table metadata

   # Pink Floyd band members
   
   [_table_meta_.reference]
   "https://en.wikipedia.org/wiki/Pink_Floyd#Band_members"
   
   [_columns_]
   first_name,last_name,instrument
   
   [_data_]
   Syd,Barret,"guitar, vocals"
   David,Gilmour,"guitar, vocals"
   Roger,Waters,"bass, vocals"
   Richard,Wright,"keyboards, vocals"
   Nick,Mason,drums
   

4. Add column metadata

   # Pink Floyd band members
   
   [_table_meta_.reference]
   "https://en.wikipedia.org/wiki/Pink_Floyd#Band_members"
   
   [_column_meta_.unique]
   true,true,false
   
   [_columns_]
   first_name,last_name,instrument
   
   [_data_]
   Syd,Barret,"guitar, vocals"
   David,Gilmour,"guitar, vocals"
   Roger,Waters,"bass, vocals"
   Richard,Wright,"keyboards, vocals"
   Nick,Mason,drums
   

5. Save more than one table

   If you want to save more than one table you must use a namespace for each table.

   # Table 1 - Pink Floyd band members
   
   [members._table_meta_.reference]
   "https://en.wikipedia.org/wiki/Pink_Floyd#Band_members"
   
   [members._column_meta_.unique]
   true,true,false
   
   [members._columns_]
   first_name,last_name,instrument
   
   [members._data_]
   Syd,Barret,"guitar, vocals"
   David,Gilmour,"guitar, vocals"
   Roger,Waters,"bass, vocals"
   Richard,Wright,"keyboards, vocals"
   Nick,Mason,drums
   
   # Table 2 - Pink Floyd albums
   
   [albums._columns_]
   name,year
   [albums._data_]
   Animals,1997
   "The Dark Side of the Moon",1973
   

Read a .csvm file

Installation pip install csvm

import csvm

# Load TableCollection (if multiple tables) or Table (if one table)
tc = csvm.read_csvm("pink_floyd.csvm") 
print(tc.tables)
members = tc['members'] # get Table
# Access Table attributes if exist (i.e. Table.columns, Table.column_meta, Table.table_meta, Table.data, Table.name)
print(members.data)