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Perl to Python functions translation map

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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
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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 =  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. 
  1. while (my ($key,$value) = each %ENV) {
  2. print "$key=$value\n";
  3. }
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()
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(),
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(), s.recv()
readdir() N/A
readline() f.readline()
readlink() os.readlink()
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(),
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
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 ;-)

Name Action
help() Invoke the built-in help system.
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.
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.
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.

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