GcodeParser

A simple gcode parser that can be used to parse a gcode file into python GcodeLine objects.

The structure of the python object is:

G1 X10 Y-2.5 ; this is a comment

GcodeLine(
  command = ('G', 1),
  params = {'X': 10, 'Y': -2.5},
  comment = 'this is a comment',
  line_index = 0,
  type = Commands.MOVE # Commands.MOVE, Commands.COMMENT, Commands.OTHER, Commands.TOOLCHANGE
)

Install

pip install gcodeparser

Alternatively:

pip install -e "git+https://github.com/AndyEveritt/GcodeParser.git@master#egg=gcodeparser"

Usage

from gcodeparser import parse_gcode_lines

# Recommended: iterate over lines in a file
with open('my_gcode.gcode', 'r') as f: # note that file should be open during iteration
    for line in parse_gcode_lines(f, include_comments=False):
        print(line)

# Alternative: open gcode file and parse lines into a list without iteration
with open('my_gcode.gcode', 'r') as f:
    lines = list(parse_gcode_lines(f, include_comments=False))

# Also, we can convert string to parsed lines
with open('my_gcode.gcode', 'r') as f:
    gcode = f.read()
lines = list(parse_gcode_lines(gcode, include_comments=False))

output:

[GcodeLine(command=('G', 10), params={'P': 0, 'R': 0, 'S': 0}, comment='sets the standby temperature'),
 GcodeLine(command=('G', 29), params={'S': 1}, comment=''),
 GcodeLine(command=('T', 0), params={}, comment=''),
 GcodeLine(command=('G', 21), params={}, comment='set units to millimeters'),
 GcodeLine(command=('G', 90), params={}, comment='use absolute coordinates'),
 GcodeLine(command=('M', 83), params={}, comment='use relative distances for extrusion'),
 GcodeLine(command=('G', 1), params={'E': -0.6, 'F': 3600.0}, comment=''),
 GcodeLine(command=('G', 1), params={'Z': 0.45, 'F': 7800.0}, comment=''),
 GcodeLine(command=('G', 1), params={'Z': 2.35}, comment=''),
 GcodeLine(command=('G', 1), params={'X': 119.575, 'Y': 89.986}, comment=''),
 GcodeLine(command=('G', 1), params={'Z': 0.45}, comment=''),
 GcodeLine(command=('G', 1), params={'E': 0.6, 'F': 3600.0}, comment=''),
 GcodeLine(command=('G', 1), params={'F': 1800.0}, comment=''),
 GcodeLine(command=('G', 1), params={'X': 120.774, 'Y': 88.783, 'E': 0.17459}, comment=''),
 GcodeLine(command=('G', 1), params={'X': 121.692, 'Y': 88.145, 'E': 0.11492}, comment=''),
 GcodeLine(command=('G', 1), params={'X': 122.7, 'Y': 87.638, 'E': 0.11596}, comment=''),
 GcodeLine(command=('G', 1), params={'X': 123.742, 'Y': 87.285, 'E': 0.11317}, comment=''),
 ...
]

Include Comments

parse_gcode_lines() takes a second argument called include_comments which defaults to False. If this is set to True then any line from the gcode file which only contains a comment will also be included in the output.

from gcodeparser import parse_gcode_lines

gcode = """G1 X1 ; this comment is always included
; this comment will only be included if `include_comments=True`"""

lines = list(parse_gcode_lines(gcode, include_comments=True))

If include_comments is True then the comment line will be in the form of:

GcodeLine(
  command = (';', None),
  params = {},
  comment = 'this comment will only be included if `include_comments=True`',
)

Convert Command Tuple to String

The GcodeLine class has a property command_str which will return the command tuple as a string. ie ('G', 91) -> "G91".

Changing back to Gcode String

The GcodeLine class has a property gcode_str which will return the equivalent gcode string.

This was called to_gcode() in version 0.0.6 and before.

Retrieving Params

To retrieve a param, use the method get_param(param: str, return_type=None, default=None) which returns the value of the param if it exists, otherwise it will the default value. If return_type is set, the return value will be type cast.

line.get_param('X')

Updating Params

To update a param, use the method update_param(param: str, value: int | float)

line.update_param('X', 10)

If the param does not exist, it will return None else it will return the updated value.

Deleting Params

To delete a param, use the method delete_param(param: str)

line.delete_param('X')

Converting to DataFrames

If for whatever reason you want to convert your list of GcodeLine objects into a pandas dataframe:

from gcodeparser import parse_gcode_lines
import pandas as pd

with open('my_gcode.gcode', 'r') as f:
    lines = list(parse_gcode_lines(f))
df = pd.DataFrame(lines)