Tcl Equivalents of Python Modules, a resource for Python programmers who have seen the light and are migrating Tcl, maps Python modules to equivalent Tcl packages. APN A cautionary note - the Tcl column is empty not because the functionality is unavailable, but because no one finds it worthwhile to complete the table!

DKF Also note that some of these modules make no sense for Tcl.

The Python Standard Library  edit

Python Module	Python Code	Tcl Package	Tcl Code	Notes
Built-in Types
Truth Value Testing
Boolean Operations
Comparisons
Numeric Types
Iterator Types
Sequence Types			list, etc.
Text Sequence Types			string, etc.	Direct feature of Tcl
Binary Sequence Types			binary, etc.	Direct feature of Tcl
Set Types
Mapping Types			array, dict	Direct feature of Tcl
Context Manager Types
Other Built-in Types
Special Attributes
Built-in Exceptions
Text Processing Services
string		string
	'good morning'.capitalize()		[string totitle] {good morning}
	'good morning'.startswith(somevar)		string equal -length [string length $somevar] $somevar {good morning}]
re			regexp, regsub
difflib
textwrap
upicodeata
stringprep
readline
rlcompleter
Binary Data Services
struct
codecs			binary encode, binary decode, encoding
Data Types
datetime		clock
	datetime.date.today()		clock format [clock seconds] -format {%Y %m %d}
calendar
collections
collections.abc
heapq
bisect
array
weakref				Not meaningful in Tcl
types
copy
pprint
reprlib
Numeric and Mathematical Modules
numbers
math
cmath
	phase(complex(-1.0, 0.0))		expr {atan2(0.0 ,-1.0)}
decimal
fractions
random
	seed(100)		expr {srand(100)}	also returns the first random number
Functional Programming Modules
itertools
functools
operator
File and Directory Access
os.path			file
fileinput
stat			file stat, file lstat
filecmp
tempfile
glob	glob.glob('./[0-9].*')	glob	glob {./[0-9].*}
fnmatch
linecache
shutil
macpath
Data Persistence
pickle
copyreg
shelve
marshal
dbm
sqlite3		sqlite (built-in from 8.6)
Data Compression and Archiving
zlib			zlib command, 8.6
gzip
bz2
lzma
zipfile
tarfile		Tcllib tar
File Formats
csv			csv	Tcllib
configparser
netrc
xdrlib
plistlib
Cryptographic Services
hashlib
hmac
Generic Operating System Services
os
	walk	fileutil::traverse
io
time
argparse
optparse
getopt
logging
logging.config
logging.handlers
getpass
curses
curses.textpad
curses.ascii
curses.panel
platform
errno
ctypes
Concurrent Execution
threading			thread
multiprocessing
The concurrent package
concurrent.futures
subprocess
sched
queue
select			fileevent, after	Tcl has built-in support for this, but in a way that is more portable to other operating systems and underlying OS APIs
dummy_thread
_thread
_dummy_thread
Interprocess Communication and Networking
socket			socket	Tcl only has built-in support for TCP sockets; UDP available via packages
ssl
asyncore				Tcl has built-in support for async I/O
asynchat
signal
mmap
Internet Data Handling
email
json			rl_json
mailcap
mailbox
mimetypes
base64			binary encode base64, binary decode base64	See base64 page on this Wiki for discussion on Tcl older than 8.6
binhex
binascii
quopri
uu
Structured Markup Processing Tools
html
html.parser
html.entities
XML Processing Modules
XML Vulnerabilites
xml.etree.ElementTree
xml.dom			tDOM
xml.dom.minidom
xml.dom.pulldom
xml.sax
xml.sax.handler
xml.sax.saxutils
xml.sax.xmlreader
xml.parsers.expat
Internet Protocols and Support
webbrowser
cgi
cgitb
wsgiref
urllib
urllib.request
urllib.response
urllib.parse
urllib.error
urllib.rebotparser
http			http
http.client
ftplib
poplib
imaplib
nntplib
smtplib
smtpd
telnetlib
uuid
socketserver
http.server
http.cookies
http.cookie jar
xmlrpc
xmlrpc.client
xmlrpc.server
ipaddress
Multimedia Services
audioop
aifc
sunau
wave
chunk
colorsys
imghdr
sndhdr
ossaudiodev
Internationalization
gettext			msgcat
locale
Program Frameworks
turtle
cmd
shlex
Graphical User Interfaces with Tk
tkinter			tk
tkinter.ttk			ttk
tkinter.tix			tix
tkinter.scrolledtext
IDLE
Other Graphical User Interface Packages
Development Tools
pydoc
doctest
unittest
unittest.mock
unittest.mock
2to3
test
test.support
venv
Debugging and Profiling
bdb
faulthandler
pdb
the Python Debugger
timeit			time
trace
Python Runtime Services
sys
sysconfig
builtins
_main_
warnings
contestlib
abc
atexit
traceback
_future_
gc
inspect
site
fpectl
distutils
Custom Python Interpreters
code
codeop
Importing Modules
imp
zipimport
pkgutil
modulefinder
runpy
importlib
Python Language Services
parser
ast
symtable
symbol
token
keyword
tokenize
tabnanny
pyclbr
py_compile
compileall
dis
pickletools
Miscellaneous Services
formatter
MS Windows Specific Services
msilib
msvcrt
winreg		registry
winsound
Unix Specific Services
posix
pwd
spwd
grp
crypt
termios
tty
pty				Tcl programmers would usually use expect instead of this; API very different
fcntl
pipes
resource
nis
syslog

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