Nuke TCL/Python Snippets

Helpful documentation

Nuke Python Developer's Guide
Nuke Python API
Knob Types
Some Flags

TCL:

	# Get input node name
	[value this.input0.name][python nuke.thisNode().input(0).name()]
	# Set a variable in expression with TCL:
	[set VARIABLENAME VALUE; return]
	# Use a variable
	$VARIABLENAME
	# String Operation that return the 5th character from top input name
	[string index [value [topnode this.input0].name] 5]
	# String Operation that convert string to lowercase
	[string tolower [value]]
	# Check if anything is plugged into inpu
	[exists this.input0]]if nuke.thisNode().input(0)
	# Check if anything is plugged into input 1
	[value [topnode this.input0].name][exists parent.[string tolower [value [topnode this.input1].name]]]
	# This handy getting filename from topmost read I grabbed from
	# http://www.nukepedia.com/tcl/write-nodes-filename-from-topmost-read
	[lindex [split [lindex [split [knob [topnode].file] .] 0] /] end][file dirname [knob [topnode].file]]/[lindex [split [lindex [split [knob [topnode].file] .] 0] /] end]_conv.%04d.exr
	# Get nuke script base name without file extension
	[lindex [split [file rootname [python nuke.root().knob('name').value()]] /] end]
	# Read metadata with TCL
	[metadata input/filename]
	# Using expressions in Text node (needs to square bracket the whole thing):
	[expression frame==1?1:0]
	# Get Bezier1's point 0 (which is first point) position in Roto1 node :
	[value Roto1.curves.Bezier1.curve_points.0.main]

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Python:

	# Get the last letter/section from node name, separated by "_":
	nuke.thisNode().name().rsplit("_").__getitem__(2)
	# From the above, can be modified to acquire file extension
	nuke.thisNode()['file'].getValue().rsplit(".").__getitem__(2)
	# Set expression with python found in the link below, especially useful when setting expression to a dropdown menu which is usually not accessible
	# http://nuke.yellow-ant.net/set-expression-via-python/
	nuke.selectedNode()['antialiasing'].setExpression('$gui? 0:3')
	# List of all nodes but exclude selected ones:
	n = nuke.allNodes()
	for i in nuke.selectedNodes():
	n.remove(i)
	return n
	# Replace frame paddings (%04d) and extension with .mov
	import re
	v = nuke.toNode('Read1')['file'].value()
	print re.sub(r'%.*d.exr', 'mov', v)
	# Search for frame paddings
	f = nukescripts.replaceHashes(nuke.filename(n))
	padd = re.search(r'%.*d', f) print padd.group(0)
	# Check if program exist from python script
	shutil.which
	# Above was introduced in Python 3.3 and is cross-platform, supporting Linux, Mac, and Windows. It is also available in Python 2.x via whichcraft.
	def is_tool(name):
	"""Check whether `name` is on PATH and marked as executable."""
	# from whichcraft import which
	from shutil import which
	return which(name) is not None
	# python2 method to check if program exists
	def is_tool(name):
	"""Check whether `name` is on PATH."""
	from distutils.spawn import find_executable
	return find_executable(name) is not None
	# Get working directory in python
	import os
	print os.getcwd()
	# Check if variable not equal to multiple things
	while choice not in [1, 2, 3]:
	# Get filename from path
	import os
	#Get filename with extension
	name = os.path.basename(path)
	#filename without extension
	os.path.splitext(name)[0] #extension is [1]
	# Check if node is gizmo
	print 'gizmo_file' in nuke.selectedNode().knobs()
	Get list of nodes inside selected gizmo
	nodes = nuke.allNodes(group=nuke.selectedNode())

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