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Perl to Python functions translation map

News	Scripting Languages	Best Python books for system administrators	Recommended Links	Python for Perl programmers	Debugging in Python	Perl to Python translation
Python installation	Installing Python 3 from RPMs	Installing Python Packages	Compiling Python from source		Python coroutines	Generators as semi-coroutines
Perl to Python functions map	Control Flow Statements	Execution of commands and capturing output of shell scripts and pipelines	Programming environment	Python Braces Debate	Python IDEs	Pycharm IDE
Command-Line Syntax and Options	pdb — The Python Debugger	Quotes	Python history	Tutorials	Python Cheatsheets	Etc

Adapted from PERL TO PYTHON QUICK REFERENCE - Perl To Python Migration [Book] by Martin C. Brown

With some additions and corrections

`<>`	in scalar contest `f = x.read()` or `x.readline()` in array context (slurping) `text_array = x.readlines()`See Python File Slurp - Stack Overflow
`abs()`	`abs()`
`accept()`	`s.accept()`
alarm()	signal.alarm()
`atan2()`	math.atan2(), cmath.atan2()
`bind()`	`s.bind()`
`binmode()`	`N/A`
`bless()`	`N/A`
`caller()`	`traceback.print_tb()`
`chdir()`	`os.chdir()`
`chmod()`	`os.chmod()`
`chomp()`	`string.rstrip(`) It returns the new string with trailing whitespace removed. See Description
`chop()`	`line=line[0:-1]` Various other methods available.
`chown()`	`os.chown()`
`chr()`	`chr()`
`chroot()`	`N/A`
`close()`	`f.close(), s.close()`
`closedir()`	Use glob.glob() to get a list of files and iterate over the list
`connect()`	s.connect()
`continue`	`N/A`
`cos()`	math.cos(), cmath.cos()
`defined()`	`array[i]==None` Difficult to translate as out of bound reference to the list cause exception in Python. Custom written function needed.
`delete()`	`del` In Perl delete is applicable only to hashes. There is not delete for the lists
`die()`	`raise()`
`do()`	`execfile()`
`dump()`	`N/A`
`each()`	`in` Iterators for hashes and lists are builtin in Python. When called on a hash in list context, returns a 2-element list consisting of the key and value for the next element of a hash. while (my ($key,$value) = each %ENV) { print "$key=$value\n"; }
`eof()`	Exception in Python. In Perl Returns 1 if the next read on `FILEHANDLE` will return end of file or if FILEHANDLE is not open
`eval()`	`eval()`, `exec()`
`exec()`	`sys.exec()`
`exists()`	in Python 3.x the expression `DICT` `in KEY` checks if key exists. `Python 2.x DICT.has_key(KEY)`
`exit()`	`sys.exit()`
`exp()`	`math.exp()`, cmath.exp()
`fcntl()`	fcntl.fcntl()
`fileno()`	`f.fileno()`used only for low level POSIX tty operations.
`flock()`	fcntl.flock()
`fork`	`os.fork()`
`format()`	`print` Perl uses a writing template called a 'format' to output reports. Rarely used. See Formats - Learning Perl
`formline()`	This is an internal Perl function used by formats
`getc()`	`f.getc()`
`getgrent()`	grp.getgrall()
`getgrgid()`	grp.getgrgid()
`getgrnam()`	grp.getgrnam()
`gethostbyaddr()`	socket.gethostbyaddr()
`gethostbyname()`	socket.gethostbyname()
`gethostent()`	`N/A`
`getlogin()`	`N/A`
`getnetbyaddr()`	`N/A`
`getnetbyname()`	`N/A`
`getnetent()`	`N/A`
`getpeername()`	s.getpeername()
`getpgrp`	os.getpgrp()
`getppid`	os.getppid()
`getpriority()`	`N/A`
`getprotobyname()`	socket.getprotobyname()
`getprotobynumber()`	`N/A`
`getprotoent()`	`N/A`
`getpwent()`	pwd.getpwall()
`getpwnam()`	pwd.pwnam()
`getpwuid()`	pwd.pwuid()
`getservbyname()`	`N/A`
`getservbyport()`	`N/A`
`getservent()`	`N/A`
`getsockname()`	s.getsockname()
`getsockopt()`	s.getsockopt()
`glob()`	glob.glob()
`gmtime()`	time.gmtime()
`grep()`	`filter()`
`hex()`	eval() will work for strings of the form “0xffff” – without a leading 0x this will be interpreted as an identifier and raise an exception
`import()`	Internal Perl function. The use function calls the import method for the package used
`index()`	`string.find()` NOTE: `string.index` raises exception if substring is not found
`int()`	`int()`
`ioctl()`	`fcntl.ioctl()`
`join()`	`string.join()`
`keys()`	`dict.keys()`
`kill()`	`os.kill()`
`last()`	`break` Last with the label and last with expression are not tranlatable into Python
`lc()`	`string.lower()`
`lcfirst()`	`N/A`
`length()`	`len()`
`link()`	`os.link()`
`listen()`	`s.listen()`
`local`	`N/A`
`localtime()`	`time.localtime()`
`log()`	`math.log()`, cmath.log()
`lstat()`	`os.lstat()`
`m//`	`re.match()`, but `m//g` -> `re.findall()`
`map()`	`map()`
`mkdir()`	`os.mkdir()`
`my`	`N/A`
`no`	`N/A`
`oct()`	eval() will work for strings of the form “0377” – without a leading zero this will be interpreted as a decimal
`open()`	open(), os.popen(), os.open()
`opendir()`	Use `glob.glob()` to get a list of files and iterate over the list
`ord()`	ord()
`pack()`	`struct.pack()`
`package`	NOT IMPLEMENTED. Python does not have means of creating new namespaces within main program or modules.
`pipe()`	`os.pipe()`
`pop()`	`list.pop()`
`pos()`	m.pos()
`print()`	print, f.write(), s.send()
`printf()`	`print format % tuple`
`prototype()`	`N/A`
`push()`	`list.append()`
`q/STRING/`	`""" ... """`
`qq/STRING/`	`""" ... """`
`qr//`	`r' ... '`
`quotemeta()`	re.compile()
`qw//`	`Needs to be programmed via split method`
`qx//`	os.exec*()
`rand()`	whrandom.random(), whrandom.randint()
`read()`	f.read(), s.recv()
`readdir()`	`N/A`
`readline()`	f.readline()
`readlink()`	os.readlink()
`readpipe()`	os.read()
`recv()`	s.recv()
`redo()`	`N/A`
`ref()`	`type()`
`rename()`	`os.rename()`
`require`	`N/A`
`reset()`	`N/A`
`reverse()`	`s.reverse()`
`rewinddir()`	`N/A`
`rindex()`	`string.rfind()` (not not string.rindex() )
`rmdir()`	os.rmdir()
`s///`	re.sub(), re.subn()
`say`	`print`
`scalar()`	`len`
`seek()`	os.lseek(), f.seek()
`seekdir()`	Use glob.glob() to get a list of files and iterate over the list
`select (default filehandle selection)`	You can redirect the standard output by re-opening sys.stdout to point to an alternative file or other filehandle object. Use sys.__stdout__ to print to the original
`shift()`	`s.pop(0)`
`shutdown()`	`s.shutdown()`
`sin()`	`math.sin()`, cmath.sin()
`sleep()`	`time.sleep()`
`socket()`	`socket.socket()`
`socketpair()`	`N/A`
`sort()`	`s.sort()`
`splice()`	`array[x:y] = array[a,b]`
`split()`	`string.split(), re.split()`
`sprintf()`	Use the format `%` tuple operator, which returns a formatted string
`sqrt()`	`math.sqrt(), cmath.sqrt()`
`srand()`	whrandom.seed()
`stat()`	os.stat()
`STDERR`	sys.stderr (original version always available in sys.__stderr__)
`STDIN`	sys.stdin (original version always available in sys.__stdin__)
`STDOUT`	sys.stdout (original version always available in sys.__stdout__)
`study()`	`N/A`
`sub`	def (for anonymous subroutines use the lambda statement)
`substr()`	`s[x:y]`
`symlink()`	os.symlink()
`syscall()`	`N/A`
`sysopen()`	`sys.open()`
`sysread()`	`f.read()`
`sysseek()`	`f.sysseek()`
`system()`	`os.system()`
`syswrite()`	`f.write()`
`tell()`	`f.tell()`
`telldir()`	`N/A`
`tie()`	`N/A`
`tied()`	`N/A`
`time()`	`time.time()`
`times()`	`os.times()`
`tr///`	`string.maketrans(), string.translate()`
`truncate()`	`f.truncate()`
`uc()`	`string.upper()`
`ucfirst()`	`string.captilize()`
`umask()`	`os.umask()`
`undef`	`None`
`unlink()`	`os.remove()`, os.unlink()
`unpack()`	`struct.unpack()`
`unshift()`	`s.insert(0,x)`
`untie()`	`N/A`
`use`	`import`
`utime()`	`os.utime()`
`values()`	`dict.values(`)
`vec()`	`struct.pack()`
`wait()`	`os.wait()`
`waitpid()`	os.waitpid()
`wantarray()`	`N/A`
`warn()`	`N/A`
`write()`	`sys.write(), f.write()`
`-X (filetests)`	`os.access(), os.stat()`

Old News ;-)

https://leanpub.com/perl2python/read

Name	Action
help()	Invoke the built-in help system.
Number-related
abs()	Return the absolute value of a number.
pow()	Return power raised to a number.
round()	Return the rounded floating point value.
divmod()	Return a pair of numbers consisting of quotient and remainder when using integer division.
Creates Objects
ascii()	Return a string containing a printable representation of an object, but escape the non-ASCII characters.
bytearray()	Return a new array of bytes.
bytes()	Return a new "bytes" object.
chr()	Return the string representing a character.
complex()	Create a complex number or convert a string or number to a complex number.
dict()	Create a new dictionary.
enumerate()	Return an enumerate object.
frozenset()	Return a new frozenset object.
hash()	Return the hash value of the object.
id()	Return the "identity" of an object.
iter()	Return an iterator object.
list()	Return a list.
memoryview()	Return a "memory view" object created from the given argument.
object()	Return a new featureless object.
repr()	Return a string containing a printable representation of an object.
str()	Return a str version of object.
set()	Return a new set object.
slice()	Return a slice object.
tuple()	Return a tuple
type()	Return the type of an object.
Converts
bin()	Convert an integer number to a binary string.
bool()	Convert a value to a Boolean.
float()	Convert a string or a number to floating point.
format()	Convert a value to a "formatted" representation.
hex()	Convert an integer number to a hexadecimal string.
int()	Convert a number or string to an integer.
oct()	Convert an integer number to an octal string.
ord()	Return an integer representing the Unicode.
List operations
len()	Return the length (the number of items) of an object.
min()	Return the smallest item in an iterable.
max()	Return the largest item in an iterable.
sorted()	Return a new sorted list.
sum()	Sums the items of an iterable from left to right and returns the total.
Iterables
all()	Return True if all elements of the iterable are true (or if the iterable is empty).
any()	Return True if any element of the iterable is true. If the iterable is empty, return False.
callable()	Return True if the object argument appears callable, False if not.
map()	Return an iterator that applies function to every item of iterable, yielding the results.
filter()	Construct an iterator from elements of iterable for which function returns true.
zip()	Make an iterator that aggregates elements from each of the iterables.
range()	Return an iterable sequence.
next()	Retrieve the next item from the iterator.
reversed()	Return a reverse iterator.
I/O-related
dir()	Return the list of names in the current local scope.
open()	Open file and return a corresponding file object.
print()	Print objects to the stream.
input()	Reads a line from input, converts it to a string (stripping a trailing newline), and returns that.
Runs Code
compile()	Compile the source into a code or AST object.
eval()	The argument is parsed and evaluated as a Python expression.
exec()	Dynamic execution of Python code.
Other functions
classmethod()	Return a class method for the function.
getattr()	Return the value of the named attribute of an object.
setattr()	Assigns the value to the attribute.
delattr()	Deletes the named attribute of an object.
hasattr()	Return True if the name is one of the object's attributes.
globals()	Return a dictionary representing the current global symbol table.
locals()	Update and return a dictionary representing the current local symbol table.
isinstance()	Return True if the object argument is an instance.
issubclass()	Return True if class is a subclass.
property()	Return a property attribute.
staticmethod()	Return a static method for function.
super()	Return a proxy object that delegates method calls to a parent or sibling class.
vars()	Return the _dict_ attribute for a module, class, instance, or any other object.
_import_()	This function is invoked by the import statement.

Etc

Society

Groupthink : Two Party System as Polyarchy : Corruption of Regulators : Bureaucracies : Understanding Micromanagers and Control Freaks : Toxic Managers : Harvard Mafia : Diplomatic Communication : Surviving a Bad Performance Review : Insufficient Retirement Funds as Immanent Problem of Neoliberal Regime : PseudoScience : Who Rules America : Neoliberalism : The Iron Law of Oligarchy : Libertarian Philosophy

Quotes

War and Peace : Skeptical Finance : John Kenneth Galbraith :Talleyrand : Oscar Wilde : Otto Von Bismarck : Keynes : George Carlin : Skeptics : Propaganda : SE quotes : Language Design and Programming Quotes : Random IT-related quotes : Somerset Maugham : Marcus Aurelius : Kurt Vonnegut : Eric Hoffer : Winston Churchill : Napoleon Bonaparte : Ambrose Bierce : Bernard Shaw : Mark Twain Quotes

Bulletin:

Vol 25, No.12 (December, 2013) Rational Fools vs. Efficient Crooks The efficient markets hypothesis : Political Skeptic Bulletin, 2013 : Unemployment Bulletin, 2010 : Vol 23, No.10 (October, 2011) An observation about corporate security departments : Slightly Skeptical Euromaydan Chronicles, June 2014 : Greenspan legacy bulletin, 2008 : Vol 25, No.10 (October, 2013) Cryptolocker Trojan (Win32/Crilock.A) : Vol 25, No.08 (August, 2013) Cloud providers as intelligence collection hubs : Financial Humor Bulletin, 2010 : Inequality Bulletin, 2009 : Financial Humor Bulletin, 2008 : Copyleft Problems Bulletin, 2004 : Financial Humor Bulletin, 2011 : Energy Bulletin, 2010 : Malware Protection Bulletin, 2010 : Vol 26, No.1 (January, 2013) Object-Oriented Cult : Political Skeptic Bulletin, 2011 : Vol 23, No.11 (November, 2011) Softpanorama classification of sysadmin horror stories : Vol 25, No.05 (May, 2013) Corporate bullshit as a communication method : Vol 25, No.06 (June, 2013) A Note on the Relationship of Brooks Law and Conway Law

History:

Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds : Larry Wall : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOS : Programming Languages History : PL/1 : Simula 67 : C : History of GCC development : Scripting Languages : Perl history : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history

Classic books:

The Peter Principle : Parkinson Law : 1984 : The Mythical Man-Month : How to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Hater’s Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite

Most popular humor pages:

Manifest of the Softpanorama IT Slacker Society : Ten Commandments of the IT Slackers Society : Computer Humor Collection : BSD Logo Story : The Cuckoo's Egg : IT Slang : C++ Humor : ARE YOU A BBS ADDICT? : The Perl Purity Test : Object oriented programmers of all nations : Financial Humor : Financial Humor Bulletin, 2008 : Financial Humor Bulletin, 2010 : The Most Comprehensive Collection of Editor-related Humor : Programming Language Humor : Goldman Sachs related humor : Greenspan humor : C Humor : Scripting Humor : Real Programmers Humor : Web Humor : GPL-related Humor : OFM Humor : Politically Incorrect Humor : IDS Humor : "Linux Sucks" Humor : Russian Musical Humor : Best Russian Programmer Humor : Microsoft plans to buy Catholic Church : Richard Stallman Related Humor : Admin Humor : Perl-related Humor : Linus Torvalds Related humor : PseudoScience Related Humor : Networking Humor : Shell Humor : Financial Humor Bulletin, 2011 : Financial Humor Bulletin, 2012 : Financial Humor Bulletin, 2013 : Java Humor : Software Engineering Humor : Sun Solaris Related Humor : Education Humor : IBM Humor : Assembler-related Humor : VIM Humor : Computer Viruses Humor : Bright tomorrow is rescheduled to a day after tomorrow : Classic Computer Humor

The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D

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Last modified: September 06, 2020

Perl to Python functions translation map

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