Python __builtin__.bool方法代码示例

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def flatten_dtype(ndtype, flatten_base=False):
    """
    Unpack a structured data-type by collapsing nested fields and/or fields
    with a shape.

    Note that the field names are lost.

    Parameters
    ----------
    ndtype : dtype
        The datatype to collapse
    flatten_base : bool, optional
       If True, transform a field with a shape into several fields. Default is
       False.

    Examples
    --------
    >>> dt = np.dtype([('name', 'S4'), ('x', float), ('y', float),
    ...                ('block', int, (2, 3))])
    >>> np.lib._iotools.flatten_dtype(dt)
    [dtype('|S4'), dtype('float64'), dtype('float64'), dtype('int32')]
    >>> np.lib._iotools.flatten_dtype(dt, flatten_base=True)
    [dtype('|S4'), dtype('float64'), dtype('float64'), dtype('int32'),
     dtype('int32'), dtype('int32'), dtype('int32'), dtype('int32'),
     dtype('int32')]

    """
    names = ndtype.names
    if names is None:
        if flatten_base:
            return [ndtype.base] * int(np.prod(ndtype.shape))
        return [ndtype.base]
    else:
        types = []
        for field in names:
            info = ndtype.fields[field]
            flat_dt = flatten_dtype(info[0], flatten_base)
            types.extend(flat_dt)
        return types 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def str2bool(value):
    """
    Tries to transform a string supposed to represent a boolean to a boolean.

    Parameters
    ----------
    value : str
        The string that is transformed to a boolean.

    Returns
    -------
    boolval : bool
        The boolean representation of `value`.

    Raises
    ------
    ValueError
        If the string is not 'True' or 'False' (case independent)

    Examples
    --------
    >>> np.lib._iotools.str2bool('TRUE')
    True
    >>> np.lib._iotools.str2bool('false')
    False

    """
    value = value.upper()
    if value == 'TRUE':
        return True
    elif value == 'FALSE':
        return False
    else:
        raise ValueError("Invalid boolean") 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def issubclass_(arg1, arg2):
    """
    Determine if a class is a subclass of a second class.

    `issubclass_` is equivalent to the Python built-in ``issubclass``,
    except that it returns False instead of raising a TypeError if one
    of the arguments is not a class.

    Parameters
    ----------
    arg1 : class
        Input class. True is returned if `arg1` is a subclass of `arg2`.
    arg2 : class or tuple of classes.
        Input class. If a tuple of classes, True is returned if `arg1` is a
        subclass of any of the tuple elements.

    Returns
    -------
    out : bool
        Whether `arg1` is a subclass of `arg2` or not.

    See Also
    --------
    issubsctype, issubdtype, issctype

    Examples
    --------
    >>> np.issubclass_(np.int32, int)
    True
    >>> np.issubclass_(np.int32, float)
    False

    """
    try:
        return issubclass(arg1, arg2)
    except TypeError:
        return False 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def _add_aliases():
    for type_name, info in typeinfo.items():
        if isinstance(info, type):
            continue
        name = english_lower(type_name)

        # insert bit-width version for this class (if relevant)
        base, bit, char = bitname(info.type)
        if base[-3:] == 'int' or char[0] in 'ui':
            continue
        if base != '':
            myname = "%s%d" % (base, bit)
            if (name not in ('longdouble', 'clongdouble') or
                   myname not in allTypes):
                base_capitalize = english_capitalize(base)
                if base == 'complex':
                    na_name = '%s%d' % (base_capitalize, bit//2)
                elif base == 'bool':
                    na_name = base_capitalize
                else:
                    na_name = "%s%d" % (base_capitalize, bit)

                allTypes[myname] = info.type

                # add mapping for both the bit name and the numarray name
                sctypeDict[myname] = info.type
                sctypeDict[na_name] = info.type

                # add forward, reverse, and string mapping to numarray
                sctypeNA[na_name] = info.type
                sctypeNA[info.type] = na_name
                sctypeNA[info.char] = na_name
        if char != '':
            sctypeDict[char] = info.type
            sctypeNA[char] = na_name 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def issubsctype(arg1, arg2):
    """
    Determine if the first argument is a subclass of the second argument.

    Parameters
    ----------
    arg1, arg2 : dtype or dtype specifier
        Data-types.

    Returns
    -------
    out : bool
        The result.

    See Also
    --------
    issctype, issubdtype,obj2sctype

    Examples
    --------
    >>> np.issubsctype('S8', str)
    True
    >>> np.issubsctype(np.array([1]), int)
    True
    >>> np.issubsctype(np.array([1]), float)
    False

    """
    return issubclass(obj2sctype(arg1), obj2sctype(arg2)) 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def str2bool(value):
    """
    Tries to transform a string supposed to represent a boolean to a boolean.

    Parameters
    ----------
    value : str
        The string that is transformed to a boolean.

    Returns
    -------
    boolval : bool
        The boolean representation of `value`.

    Raises
    ------
    ValueError
        If the string is not 'True' or 'False' (case independent)

    Examples
    --------
    >>> np.lib._iotools.str2bool('TRUE')
    True
    >>> np.lib._iotools.str2bool('false')
    False

    """
    value = value.upper()
    if value == asbytes('TRUE'):
        return True
    elif value == asbytes('FALSE'):
        return False
    else:
        raise ValueError("Invalid boolean") 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
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 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def issubclass_(arg1, arg2):
    """
    Determine if a class is a subclass of a second class.

    `issubclass_` is equivalent to the Python built-in ``issubclass``,
    except that it returns False instead of raising a TypeError if one
    of the arguments is not a class.

    Parameters
    ----------
    arg1 : class
        Input class. True is returned if `arg1` is a subclass of `arg2`.
    arg2 : class or tuple of classes.
        Input class. If a tuple of classes, True is returned if `arg1` is a
        subclass of any of the tuple elements.

    Returns
    -------
    out : bool
        Whether `arg1` is a subclass of `arg2` or not.

    See Also
    --------
    issubsctype, issubdtype, issctype

    Examples
    --------
    >>> np.issubclass_(np.int32, np.int)
    True
    >>> np.issubclass_(np.int32, np.float)
    False

    """
    try:
        return issubclass(arg1, arg2)
    except TypeError:
        return False 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def issubsctype(arg1, arg2):
    """
    Determine if the first argument is a subclass of the second argument.

    Parameters
    ----------
    arg1, arg2 : dtype or dtype specifier
        Data-types.

    Returns
    -------
    out : bool
        The result.

    See Also
    --------
    issctype, issubdtype,obj2sctype

    Examples
    --------
    >>> np.issubsctype('S8', str)
    True
    >>> np.issubsctype(np.array([1]), np.int)
    True
    >>> np.issubsctype(np.array([1]), np.float)
    False

    """
    return issubclass(obj2sctype(arg1), obj2sctype(arg2)) 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def issubdtype(arg1, arg2):
    """
    Returns True if first argument is a typecode lower/equal in type hierarchy.

    Parameters
    ----------
    arg1, arg2 : dtype_like
        dtype or string representing a typecode.

    Returns
    -------
    out : bool

    See Also
    --------
    issubsctype, issubclass_
    numpy.core.numerictypes : Overview of numpy type hierarchy.

    Examples
    --------
    >>> np.issubdtype('S1', str)
    True
    >>> np.issubdtype(np.float64, np.float32)
    False

    """
    if issubclass_(arg2, generic):
        return issubclass(dtype(arg1).type, arg2)
    mro = dtype(arg2).type.mro()
    if len(mro) > 1:
        val = mro[1]
    else:
        val = mro[0]
    return issubclass(dtype(arg1).type, val)


# This dictionary allows look up based on any alias for an array data-type 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
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 

# 需要导入模块: import __builtin__ [as 别名]
# 或者: from __builtin__ import bool [as 别名]
def issubclass_(arg1, arg2):
    """
    Determine if a class is a subclass of a second class.

    `issubclass_` is equivalent to the Python built-in ``issubclass``,
    except that it returns False instead of raising a TypeError is one
    of the arguments is not a class.

    Parameters
    ----------
    arg1 : class
        Input class. True is returned if `arg1` is a subclass of `arg2`.
    arg2 : class or tuple of classes.
        Input class. If a tuple of classes, True is returned if `arg1` is a
        subclass of any of the tuple elements.

    Returns
    -------
    out : bool
        Whether `arg1` is a subclass of `arg2` or not.

    See Also
    --------
    issubsctype, issubdtype, issctype

    Examples
    --------
    >>> np.issubclass_(np.int32, np.int)
    True
    >>> np.issubclass_(np.int32, np.float)
    False

    """
    try:
        return issubclass(arg1, arg2)
    except TypeError:
        return False