How to use the rez.vendor.schema.schema.And function in rez

FileSystemPackageResource.key,
            location=self.location,
            name=self.name,
            version=self.get("version"))
        return package


# -- 'combined' resource types

class FileSystemCombinedPackageFamilyResource(PackageFamilyResource):
    key = "filesystem.family.combined"
    repository_type = "filesystem"

    schema = Schema({
        Optional("versions"): [
            And(basestring, Use(Version))
        ],
        Optional("version_overrides"): {
            And(basestring, Use(VersionRange)): dict
        }
    })

    @property
    def ext(self):
        return self.get("ext")

    @property
    def filepath(self):
        filename = "%s.%s" % (self.name, self.ext)
        return os.path.join(self.location, filename)

    def _uri(self):

Optional("requires"): [package_request_schema],
            Optional("run_on"): Or(basestring, [basestring]),
            Optional("on_variants"): Or(
                bool,
                {
                    "type": "requires",
                    "value": [package_request_schema]
                }
            )
        })
    )
})


package_schema = Schema({
    Optional("requires_rez_version"):   And(basestring, Use(Version)),

    Required("name"):                   basestring,
    Optional("base"):                   basestring,
    Optional("version"):                Or(basestring,
                                           And(Version, Use(str))),
    Optional('description'):            basestring,
    Optional('authors'):                [basestring],

    Optional('requires'):               late_bound([package_request_schema]),
    Optional('build_requires'):         late_bound([package_request_schema]),
    Optional('private_build_requires'): late_bound([package_request_schema]),

    # deliberately not possible to late bind
    Optional('variants'):               [[package_request_schema]],

    Optional('hashed_variants'):        bool,

def _to(value):
        if isinstance(value, dict):
            d = {}
            for k, v in value.items():
                if isinstance(k, basestring):
                    k = Required(k) if required else Optional(k)
                d[k] = _to(v)
            if allow_custom_keys:
                d[Optional(basestring)] = modifier or object
            schema = Schema(d)
        elif modifier:
            schema = And(value, modifier)
        else:
            schema = value
        return schema

    @cached_class_property
    def schema(cls):
        from rez.utils.platform_ import platform_

        # Note that this bakes the physical / logical cores at the time the
        # config is read... which should be fine
        return Or(
            And(int, lambda x: x > 0),
            And("physical_cores", Use(lambda x: platform_.physical_cores)),
            And("logical_cores", Use(lambda x: platform_.logical_cores)),
        )

"type": "requires",
                    "value": [package_request_schema]
                }
            )
        })
    )
})


package_schema = Schema({
    Optional("requires_rez_version"):   And(basestring, Use(Version)),

    Required("name"):                   basestring,
    Optional("base"):                   basestring,
    Optional("version"):                Or(basestring,
                                           And(Version, Use(str))),
    Optional('description'):            basestring,
    Optional('authors'):                [basestring],

    Optional('requires'):               late_bound([package_request_schema]),
    Optional('build_requires'):         late_bound([package_request_schema]),
    Optional('private_build_requires'): late_bound([package_request_schema]),

    # deliberately not possible to late bind
    Optional('variants'):               [[package_request_schema]],

    Optional('hashed_variants'):        bool,

    Optional('relocatable'):            late_bound(Or(None, bool)),
    Optional('cachable'):               late_bound(Or(None, bool)),

    Optional('uuid'):                   basestring,

try:
                v = int(v)
            except ValueError:
                try:
                    v = float(v)
                except ValueError:
                    pass

            result[k] = v

        return result


class OptionalDict(Dict):
    schema = Or(And(None, Use(lambda x: {})),
                dict)


class OptionalDictOrDictList(Setting):
    schema = Or(And(None, Use(lambda x: [])),
                And(dict, Use(lambda x: [x])),
                [dict])


class SuiteVisibility_(Str):
    @cached_class_property
    def schema(cls):
        from rez.resolved_context import SuiteVisibility
        return Or(*(x.name for x in SuiteVisibility))

from rez.package_py_utils import expand_requirement
from rez.vendor.schema.schema import Schema, Optional, Or, Use, And
from rez.vendor.six import six
from rez.vendor.version.version import Version
from contextlib import contextmanager
import os


basestring = six.string_types[0]


# this schema will automatically harden request strings like 'python-*'; see
# the 'expand_requires' function for more info.
#
package_request_schema = Or(And(basestring, Use(expand_requirement)),
                            And(PackageRequest, Use(str)))

tests_schema = Schema({
    Optional(basestring): Or(
        Or(basestring, [basestring]),
        extensible_schema_dict({
            "command": Or(basestring, [basestring]),
            Optional("requires"): [package_request_schema],
            Optional("run_on"): Or(basestring, [basestring]),
            Optional("on_variants"): Or(
                bool,
                {
                    "type": "requires",
                    "value": [package_request_schema]
                }
            )
        })

if isinstance(k, basestring):
                    k_ = Required(k) if required else Optional(k)
                else:
                    k_ = k
                d[k_] = _to(v)
            if allow_custom_keys:
                d[Optional(basestring)] = (Expand()
                                           if inject_expansion else object)
            schema = Schema(d)
        else:
            if type(value) is type and issubclass(value, Setting):
                schema = value.schema
            else:
                schema = value
            if inject_expansion:
                schema = And(schema, Expand())
        return schema

variant_schema = Schema(variant_schema_dict)


# ------------------------------------------------------------------------------
# schemas for converting from POD datatypes
# ------------------------------------------------------------------------------

_commands_schema = Or(SourceCode,       # commands as converted function
                      callable,         # commands as function
                      basestring,       # commands in text block
                      [basestring])     # old-style (rez-1) commands

_function_schema = Or(SourceCode, callable)

_package_request_schema = And(basestring, Use(PackageRequest))

package_pod_schema_dict = base_resource_schema_dict.copy()

large_string_dict = And(basestring, Use(lambda x: dedent(x).strip()))


package_pod_schema_dict.update({
    Optional("base"):                   basestring,
    Optional("version"):                And(basestring, Use(Version)),
    Optional('description'):            large_string_dict,
    Optional('authors'):                [basestring],

    Optional('requires'):               late_bound([_package_request_schema]),
    Optional('build_requires'):         late_bound([_package_request_schema]),
    Optional('private_build_requires'): late_bound([_package_request_schema]),