我经常使用conda环境进行开发，但我在conda env中遇到了奇怪的问题。我克隆了这个python repository。然后，我尝试运行一个示例，但即使有import 'package:meta/meta.dart';
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
void main() {
runApp(new MaterialApp(home: new LoginPage()));
}
/// A widget that ensures it is always visible when focused.
class EnsureVisibleWhenFocused extends StatefulWidget {
const EnsureVisibleWhenFocused({
Key key,
@required this.child,
@required this.focusNode,
this.curve: Curves.ease,
this.duration: const Duration(milliseconds: 100),
}) : super(key: key);
/// The node we will monitor to determine if the child is focused
final FocusNode focusNode;
/// The child widget that we are wrapping
final Widget child;
/// The curve we will use to scroll ourselves into view.
///
/// Defaults to Curves.ease.
final Curve curve;
/// The duration we will use to scroll ourselves into view
///
/// Defaults to 100 milliseconds.
final Duration duration;
EnsureVisibleWhenFocusedState createState() => new EnsureVisibleWhenFocusedState();
}
class EnsureVisibleWhenFocusedState extends State<EnsureVisibleWhenFocused> {
@override
void initState() {
super.initState();
widget.focusNode.addListener(_ensureVisible);
}
@override
void dispose() {
super.dispose();
widget.focusNode.removeListener(_ensureVisible);
}
Future<Null> _ensureVisible() async {
// Wait for the keyboard to come into view
// TODO: position doesn't seem to notify listeners when metrics change,
// perhaps a NotificationListener around the scrollable could avoid
// the need insert a delay here.
await new Future.delayed(const Duration(milliseconds: 600));
if (!widget.focusNode.hasFocus)
return;
final RenderObject object = context.findRenderObject();
final RenderAbstractViewport viewport = RenderAbstractViewport.of(object);
assert(viewport != null);
ScrollableState scrollableState = Scrollable.of(context);
assert(scrollableState != null);
ScrollPosition position = scrollableState.position;
double alignment;
if (position.pixels > viewport.getOffsetToReveal(object, 0.0)) {
// Move down to the top of the viewport
alignment = 0.0;
} else if (position.pixels < viewport.getOffsetToReveal(object, 1.0)) {
// Move up to the bottom of the viewport
alignment = 1.0;
} else {
// No scrolling is necessary to reveal the child
return;
}
position.ensureVisible(
object,
alignment: alignment,
duration: widget.duration,
curve: widget.curve,
);
}
Widget build(BuildContext context) => widget.child;
}
class LoginPage extends StatefulWidget {
LoginPageState createState() => new LoginPageState();
}
class LoginPageState extends State<LoginPage> {
FocusNode _usernameFocusNode = new FocusNode();
FocusNode _passwordFocusNode = new FocusNode();
@override
Widget build(BuildContext context) {
return new Scaffold(
appBar: new AppBar(
title: new Text('Example App'),
),
body: new Container(
child: new ListView(
physics: new NeverScrollableScrollPhysics(),
key: new PageStorageKey("Divider 1"),
children: <Widget>[
new Container(
constraints: new BoxConstraints.expand(height: 640.0),
decoration: new BoxDecoration(
image: new DecorationImage(
image: new NetworkImage(
'https://flutter.io/images/flutter-mark-square-100.png',
),
fit: BoxFit.cover,
),
),
child: new Column(
children: <Widget>[
new Container(
height: 300.0,
),
new Center(
child: new EnsureVisibleWhenFocused(
focusNode: _usernameFocusNode,
child: new TextFormField(
focusNode: _usernameFocusNode,
decoration: new InputDecoration(
labelText: 'Username',
),
),
),
),
new Container(height: 8.0),
new Center(
child: new EnsureVisibleWhenFocused(
focusNode: _passwordFocusNode,
child: new TextFormField(
focusNode: _passwordFocusNode,
obscureText: true,
decoration: new InputDecoration(
labelText: 'Password',
),
),
),
),
new Container(),
new RaisedButton(
onPressed: () {},
child: new Text('Log in'),
),
new Divider(),
new RaisedButton(
onPressed: () {},
child: new Text('Sign up'),
),
],
),
),
],
),
),
);
}
}
目录，它仍然失败ModuleNotFoundError。
parlai但如果我不使用conda env，我可以成功在同一目录上运行代码。在我的环境中发生了什么？
(torch) $ which python
/Users/jef/anaconda/envs/torch/bin/python
(torch) $ python -V
Python 3.6.1 :: Continuum Analytics, Inc.
(torch) $ python examples/train_model.py -m drqa -t squad -bs 32 -mf /tmp/model_drqa
Traceback (most recent call last):
File "examples/train_model.py", line 26, in <module>
from parlai.core.agents import create_agent
ModuleNotFoundError: No module named 'parlai'
答案 0 :(得分：1)
您的软件包尚未安装。
转到下载的文件夹并输入：
python setup.py install
这会将parlai安装到您的环境中，您可以安全地删除该文件夹。
我认为这是在env之外工作的，因为您的路径中有一些链接到您放置parlai的文件夹的内容。