Fix issues with * import in helpers module

Signed-off-by: Fabrice Normandin <fabrice.normandin@gmail.com>

Author: lebrice

examples/simple/flag.py

@@ -1,17 +1,9 @@
 from dataclasses import dataclass
 
-from simple_parsing import ArgumentParser
+from simple_parsing import ArgumentParser, parse
 from simple_parsing.helpers import flag
 
 
-def parse(cls, args: str = ""):
-    """Removes some boilerplate code from the examples."""
-    parser = ArgumentParser()  # Create an argument parser
-    parser.add_arguments(cls, dest="hparams")  # add arguments for the dataclass
-    ns = parser.parse_args(args.split())  # parse the given `args`
-    return ns.hparams
-
-
 @dataclass
 class HParams:
     """Set of options for the training of a Model."""
@@ -32,10 +24,10 @@ class HParams:
 """
 
 # Example 2 using the flags negative prefix
-assert parse(HParams, "--no-train") == HParams(train=False)
+assert parse(HParams, args="--no-train") == HParams(train=False)
 
 
-# showing what --help outputs 
+# showing what --help outputs
 parser = ArgumentParser()  # Create an argument parser
 parser.add_arguments(HParams, dest="hparams")  # add arguments for the dataclass
 parser.print_help()
@@ -56,4 +48,4 @@ class HParams:
                         (default: 0.001)
   --train bool, --no-train bool
                         (default: True)
-"""
+"""

simple_parsing/helpers/__init__.py

@@ -1,5 +1,15 @@
-""" Collection of helper classes and functions to reduce boilerplate code. """
-from .fields import *
+"""Collection of helper classes and functions to reduce boilerplate code."""
+from .fields import (
+    field,
+    choice,
+    list_field,
+    dict_field,
+    set_field,
+    mutable_field,
+    subparsers,
+    flag,
+    flags,
+)
 from .flatten import FlattenedAccess
 from .hparams import HyperParameters
 from .partial import Partial, config_for
@@ -13,3 +23,26 @@
 # For backward compatibility purposes
 JsonSerializable = Serializable
 SimpleEncoder = SimpleJsonEncoder
+
+__all__ = [
+    "FlattenedAccess",
+    "HyperParameters",
+    "Partial",
+    "config_for",
+    "FrozenSerializable",
+    "Serializable",
+    "SimpleJsonEncoder",
+    "encode",
+    "JsonSerializable",
+    "SimpleEncoder",
+    "YamlSerializable",
+    "field",
+    "choice",
+    "list_field",
+    "dict_field",
+    "set_field",
+    "mutable_field",
+    "subparsers",
+    "flag",
+    "flags",
+]