M.Laloux mlaloux

## Updating Attributes using Pyshp .py

It is the same thing with pyshp, except that you cannot update directly the dbf file. When you read a shapefile, the data are stored in Python lists

import shapefile
input = shapefile.Reader("yourfile.shp")
shapes = input.shapes() # -> the geometries in a list
fields = input.fields[1:] -> the fields definition in a list
fields_name = = [field[0] for field in fields] -> the fields names in a list
attributes = input.records() -> the attributes in a list

## tree.md

      
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                mlaloux
                / tree.md
            
            
              Created
              March 7, 2013 17:00
                — forked from hrldcpr/tree.md
            
          
    One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:
def tree(): return defaultdict(tree)
That's it!

  
## line_from_pt_dist1.py
'''For QGIS 2.8
Martin Laloux, 2012'''

from PyQt4.QtCore import *
from numpy import *

class distance(object):
       def __init__(self,a,angle,distance):
             self.a = a.asPoint()
             self.xori = self.a[0]

## line_from_pt_dist2.py
'''QGIS master with the new Python API
Martin Laloux 2013'''

from PyQt4.QtCore import *
from numpy import *

from PyQt4.QtCore import *
from numpy import *
a = QgsGeometry.fromPoint(QgsPoint(122.989235,13679.083853))

	It is the same thing with pyshp, except that you cannot update directly the dbf file. When you read a shapefile, the data are stored in Python lists

	import shapefile
	input = shapefile.Reader("yourfile.shp")
	shapes = input.shapes() # -> the geometries in a list
	fields = input.fields[1:] -> the fields definition in a list
	fields_name = = [field[0] for field in fields] -> the fields names in a list
	attributes = input.records() -> the attributes in a list
	'''For QGIS 2.8
	Martin Laloux, 2012'''

	from PyQt4.QtCore import *
	from numpy import *

	class distance(object):
	def __init__(self,a,angle,distance):
	self.a = a.asPoint()
	self.xori = self.a[0]
	'''QGIS master with the new Python API
	Martin Laloux 2013'''

	from PyQt4.QtCore import *
	from numpy import *

	from PyQt4.QtCore import *
	from numpy import *
	a = QgsGeometry.fromPoint(QgsPoint(122.989235,13679.083853))