Two-way fixed-width <--> Python dict converter.
Project description
Easy two-way conversion between Python dictionaries and fixed-width files. The FixedWidth class has been used in production without modification for several years.
This module has also proven useful for "debugging" a fixed-width spec -- an invalid configuration reports an error that may not be obvious from reading the spec document.
Requires a 'config' dictonary. See unit tests for full example.
Small example
SAMPLE_CONFIG = {
'first_name': {
'required': True,
'type': 'string',
'start_pos': 1,
'end_pos': 10,
'alignment': 'left',
'padding': ' '
},
'last_name': {
'required': True,
'type': 'string',
'start_pos': 11,
'end_pos': 30,
'alignment': 'left',
'padding': ' '
},
'date': {
'required': True,
'type': 'date',
'start_pos': 31,
'end_pos': 38,
'alignment': 'left',
'format': '%Y%m%d',
'padding': ' '
},
'decimal': {
'required': True,
'type': 'decimal',
'precision': 2,
'rounding': decimal.ROUND_UP,
'start_pos': 38,
'end_pos': 42,
'alignment': 'left',
'padding': ' '
},
}
Notes:
-
A field must have a start_pos and either an end_pos or a length. If both an end_pos and a length are provided, they must not conflict.
-
A field may not have a default value if it is required.
-
Supported types are string, integer, and decimal.
-
Alignment and padding are required.
License: BSD
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