Usage of `iff` in Python

gistfile1.txt

PC/pyconfig.h
334:/* configure.ac defines HAVE_LARGEFILE_SUPPORT iff

Python/dtoa.c
1428:    /* Skip leading zeros: lz is true iff there were leading zeros. */
1497:        /* Skip zeros.  lz is true iff there are leading zeros. */

Objects/obmalloc.c
1272:Subtracting B throughout, this is true iff

Objects/listobject.c
1146:   error.  Else "k" is set to true iff X<Y, and an "if (k)" block is

Objects/codeobject.c
114:/* all_name_chars(s): true iff s matches [a-zA-Z0-9_]* */

Python/instrumentation.c
1310:                /* Set original_opcode to the opcode iff the instruction

Doc/includes/ndiff.py
54:# open two files & spray the diff to stdout; return false iff a problem
69:# return false iff a problem

Objects/longobject.c
2200: * base B digit iff _PyLong_DigitValue[Py_CHARPyLong_MASK(c)] < B.
4270:       round up iff the most significant of the extra bits is 1, and
4780:            ++num_table_entries; /* incremented iff MULT succeeded */

Objects/abstract.c
2218:    int wrapped;  /* for PY_ITERSEARCH_INDEX, true iff n wrapped around */

Tools/patchcheck/reindent.py
185:        # Note that a line is all-blank iff it's "\n".

Doc/library/doctest.rst
1445:   iff the command-line switch ``-v`` is used.
1547:      Return ``True`` iff the actual output from an example (*got*) matches the

Lib/urllib/request.py
2555:    Return True iff this host shouldn't be accessed using a proxy

Lib/_pydecimal.py
1706:            # overflow: exp_min > Etop iff self.adjusted() > Emax
2105:        # (2) must apply.  Now |y| < 1/nbits(xc) iff |yc|*nbits(xc) <
2106:        # 10**-ye iff len(str(|yc|*nbits(xc)) <= -ye.
2344:        # result has sign 1 iff self._sign is 1 and other is an odd integer

Lib/wave.py
241:    _fmt_chunk_read -- 1 iff the FMT chunk has been read
242:    _data_seek_needed -- 1 iff positioned correctly in audio

Lib/xml/dom/minidom.py
296:    # return True iff node is part of a document tree
1178:            doc="True iff this text node contains only whitespace"
1520:        """Returns true iff this element is declared to have an EMPTY
1525:        """Returns true iff the named attribute is a DTD-style ID."""
1529:        """Returns true iff the identified attribute is a DTD-style ID."""

Lib/tabnanny.py
156:    #       n.indent_level(t) for all t >= 1 iff m.norm == n.norm.
158:    #       true iff raw[:n] is of the form (T*)(S*)
210:    # return true iff self.indent_level(t) == other.indent_level(t)
230:    # Return True iff self.indent_level(t) < other.indent_level(t)
239:    # form (T*)(S*), M.less(N) iff M.len() < N.len() and
242:    # Note that M is of the form (T*)(S*) iff len(M.norm[0]) <= 1.

Lib/_pyio.py
467:        """closed: bool.  True iff the file has been closed.

Lib/test/test_long.py
106:    # round-half-to-even: fractional part is r/b, which is > 0.5 iff
107:    # 2*r > b, and == 0.5 iff 2*r == b.

Lib/test/test_pyclbr.py
28:        ''' succeed iff {l1} - {ignore} == {l2} - {ignore} '''
35:        ''' succeed iff hasattr(obj,attr) or attr in ignore. '''
43:        ''' succeed iff key in obj or key in ignore. '''
50:        ''' succeed iff a == b or a in ignore or b in ignore '''
55:        ''' succeed iff pyclbr.readmodule_ex(modulename) corresponds

Lib/test/test_doctest.py
920:iff `-v` appears in sys.argv:

Lib/test/test_buffer.py
435:# in full generality. A structure is valid iff it fits in the

Lib/test/test_set.py
2039:    with two vertices being adjacent iff the corresponding

Lib/test/test_codeop.py
14:        '''succeed iff str is a valid piece of code'''
19:        '''succeed iff str is the start of a valid piece of code'''
23:        '''succeed iff str is the start of an invalid piece of code'''

Lib/test/test_complex.py
41:        """Return true iff floats x and y "are close"."""
76:        """Return true iff complexes x and y "are close"."""

Lib/test/test_hash.py
2:#   iff a==b then hash(a)==hash(b)

Lib/test/test_minidom.py
732:            # check the doctype iff the original DOM maintained it

Lib/email/_header_value_parser.py
1002:    a flag that is True iff there were any quoted printables decoded.
2938:    # RFC2231 encoding iff needed.

Lib/sysconfig.py
179:# True iff _CONFIG_VARS has been fully initialized.

Lib/difflib.py
124:        function that takes a sequence element and returns true iff the
170:        #      returning true iff the element is "junk" -- this has
817:          and return true iff the string is junk. The module-level function
953:        # a[best_i] very similar to b[best_j]; eqi is None iff they're not
1047:    Return True for ignorable line: iff `line` is blank or contains a single '#'.
1063:    Return True for ignorable character: iff `ch` is a space or tab.
1311:      return true iff the string is junk.  The default is None, and is
1316:      1), and returns true iff the character is junk. The default is

Lib/_pydatetime.py
2588:# So z' is UTC-equivalent to x iff z'.d = z.d at this point.  If they are equal,

Lib/doctest.py
630:    # A callable returning a true value iff its argument is a blank line
1218:        only failures if false; by default, it's true iff '-v' is in
1605:        Return True iff the actual output from an example (`got`)
1918:    only failures if false; by default, it's true iff "-v" is in sys.argv.
2031:    only failures if false; by default, it's true iff "-v" is in sys.argv.

Lib/idlelib/pyparse.py
145:        This will be reliable iff given a reliable is_char_in_string()

Modules/_pickle.c
2230:         * needed.  This is so iff the MSB is all redundant sign

Lib/idlelib/editor.py
1287:            # Return true iff colorizer hasn't (re)gotten this far

Lib/numbers.py
195:          * i > 0 iff self > 0;

Modules/_testcapi/vectorcall.c
249:Return true iff Py_TPFLAGS_HAVE_VECTORCALL is set on the class.

Lib/trace.py
393:        @param count true iff it should count number of times each
395:        @param trace true iff it should print out each line that is
397:        @param countfuncs true iff it should just output a list of
407:        @param timing true iff timing information be displayed

Lib/fileinput.py
17:line number in the current file; isfirstline() returns true iff the
19:iff the line was read from sys.stdin.  Function nextfile() closes the

Modules/socketmodule.c
2756:/* Return true iff msg->msg_controllen is valid, cmsgh is a valid

Modules/_testcapi/clinic/vectorcall.c.h
184:"Return true iff Py_TPFLAGS_HAVE_VECTORCALL is set on the class.");

Modules/_decimal/libmpdec/mpdecimal.c
3917:         * 1 / b_coeff' is exact iff b_coeff' exclusively has prime factors 2 or 5.
5047:     *   1) log10(x) < 0 iff adjexp(x) < 0
5201:     *   1) log10(x) < 0 iff adjexp(x) < 0

Modules/_datetimemodule.c
148:/* k = i+j overflows iff k differs in sign from both inputs,
149: * iff k^i has sign bit set and k^j has sign bit set,
150: * iff (k^i)&(k^j) has sign bit set.
1101:/* Create a timedelta instance.  Normalize the members iff normalize is
7069:So z' is UTC-equivalent to x iff z'.d = z.d at this point.  If they are equal,

Lib/html/entities.py
1030:    'iff;': '\u21d4',

Include/pyport.h
66:Meaning:  To be defined iff i>>j does not extend the sign bit when i is a

Misc/HISTORY
13344:  attribute that is True iff there are uncommitted changes.
21691:  True iff the current Python has IPv6 support.  See SF patch #658327.
27549:  - New symbol USE_GETHOSTBYNAME_LOCK defined iff the lock should be used.
30197:the first argument and returns true iff first is second, or is a
30199:and returns true iff first is an instance of the second, or any
30665:iff -O is not specified).  With -O, no code is generated for assert

Mac/BuildScript/build-installer.py
401:    Return True iff the default Xcode version can use PGO and LTO