我们从Python开源项目中，提取了以下36个代码示例，用于说明如何使用builtins.complex()。
def _set_array_types(): ibytes = [1, 2, 4, 8, 16, 32, 64] fbytes = [2, 4, 8, 10, 12, 16, 32, 64] for bytes in ibytes: bits = 8*bytes _add_array_type('int', bits) _add_array_type('uint', bits) for bytes in fbytes: bits = 8*bytes _add_array_type('float', bits) _add_array_type('complex', 2*bits) _gi = dtype('p') if _gi.type not in sctypes['int']: indx = 0 sz = _gi.itemsize _lst = sctypes['int'] while (indx < len(_lst) and sz >= _lst[indx](0).itemsize): indx += 1 sctypes['int'].insert(indx, _gi.type) sctypes['uint'].insert(indx, dtype('P').type)
def _add_aliases(): for a in typeinfo.keys(): name = english_lower(a) if not isinstance(typeinfo[a], tuple): continue typeobj = typeinfo[a][-1] # insert bit-width version for this class (if relevant) base, bit, char = bitname(typeobj) if base[-3:] == 'int' or char[0] in 'ui': continue if base != '': myname = "%s%d" % (base, bit) if ((name != 'longdouble' and name != 'clongdouble') or myname not in allTypes.keys()): allTypes[myname] = typeobj sctypeDict[myname] = typeobj if base == 'complex': na_name = '%s%d' % (english_capitalize(base), bit//2) elif base == 'bool': na_name = english_capitalize(base) sctypeDict[na_name] = typeobj else: na_name = "%s%d" % (english_capitalize(base), bit) sctypeDict[na_name] = typeobj sctypeNA[na_name] = typeobj sctypeDict[na_name] = typeobj sctypeNA[typeobj] = na_name sctypeNA[typeinfo[a][0]] = na_name if char != '': sctypeDict[char] = typeobj sctypeNA[char] = na_name
def complex(x): "Convert argument to a complex number." return _complex(x)
def _set_up_aliases(): type_pairs = [('complex_', 'cdouble'), ('int0', 'intp'), ('uint0', 'uintp'), ('single', 'float'), ('csingle', 'cfloat'), ('singlecomplex', 'cfloat'), ('float_', 'double'), ('intc', 'int'), ('uintc', 'uint'), ('int_', 'long'), ('uint', 'ulong'), ('cfloat', 'cdouble'), ('longfloat', 'longdouble'), ('clongfloat', 'clongdouble'), ('longcomplex', 'clongdouble'), ('bool_', 'bool'), ('unicode_', 'unicode'), ('object_', 'object')] if sys.version_info[0] >= 3: type_pairs.extend([('bytes_', 'string'), ('str_', 'unicode'), ('string_', 'string')]) else: type_pairs.extend([('str_', 'string'), ('string_', 'string'), ('bytes_', 'string')]) for alias, t in type_pairs: allTypes[alias] = allTypes[t] sctypeDict[alias] = sctypeDict[t] # Remove aliases overriding python types and modules to_remove = ['ulong', 'object', 'unicode', 'int', 'long', 'float', 'complex', 'bool', 'string', 'datetime', 'timedelta'] if sys.version_info[0] >= 3: # Py3K to_remove.append('bytes') to_remove.append('str') to_remove.remove('unicode') to_remove.remove('long') for t in to_remove: try: del allTypes[t] del sctypeDict[t] except KeyError: pass
def maximum_sctype(t): """ Return the scalar type of highest precision of the same kind as the input. Parameters ---------- t : dtype or dtype specifier The input data type. This can be a `dtype` object or an object that is convertible to a `dtype`. Returns ------- out : dtype The highest precision data type of the same kind (`dtype.kind`) as `t`. See Also -------- obj2sctype, mintypecode, sctype2char dtype Examples -------- >>> np.maximum_sctype(np.int) <type 'numpy.int64'> >>> np.maximum_sctype(np.uint8) <type 'numpy.uint64'> >>> np.maximum_sctype(np.complex) <type 'numpy.complex192'> >>> np.maximum_sctype(str) <type 'numpy.string_'> >>> np.maximum_sctype('i2') <type 'numpy.int64'> >>> np.maximum_sctype('f4') <type 'numpy.float96'> """ g = obj2sctype(t) if g is None: return t t = g name = t.__name__ base, bits = _evalname(name) if bits == 0: return t else: return sctypes[base][-1]
def sctype2char(sctype): """ Return the string representation of a scalar dtype. Parameters ---------- sctype : scalar dtype or object If a scalar dtype, the corresponding string character is returned. If an object, `sctype2char` tries to infer its scalar type and then return the corresponding string character. Returns ------- typechar : str The string character corresponding to the scalar type. Raises ------ ValueError If `sctype` is an object for which the type can not be inferred. See Also -------- obj2sctype, issctype, issubsctype, mintypecode Examples -------- >>> for sctype in [np.int32, np.float, np.complex, np.string_, np.ndarray]: ... print(np.sctype2char(sctype)) l d D S O >>> x = np.array([1., 2-1.j]) >>> np.sctype2char(x) 'D' >>> np.sctype2char(list) 'O' """ sctype = obj2sctype(sctype) if sctype is None: raise ValueError("unrecognized type") return _sctype2char_dict[sctype] # Create dictionary of casting functions that wrap sequences # indexed by type or type character
def sctype2char(sctype): """ Return the string representation of a scalar dtype. Parameters ---------- sctype : scalar dtype or object If a scalar dtype, the corresponding string character is returned. If an object, `sctype2char` tries to infer its scalar type and then return the corresponding string character. Returns ------- typechar : str The string character corresponding to the scalar type. Raises ------ ValueError If `sctype` is an object for which the type can not be inferred. See Also -------- obj2sctype, issctype, issubsctype, mintypecode Examples -------- >>> for sctype in [np.int32, np.float, np.complex, np.string_, np.ndarray]: ... print np.sctype2char(sctype) l d D S O >>> x = np.array([1., 2-1.j]) >>> np.sctype2char(x) 'D' >>> np.sctype2char(list) 'O' """ sctype = obj2sctype(sctype) if sctype is None: raise ValueError("unrecognized type") return _sctype2char_dict[sctype] # Create dictionary of casting functions that wrap sequences # indexed by type or type character
