我设法通过查看先前的答案将我的每日数据转换为每周数据，但我将日期设置为索引。我的目标是保持＆＃39; Symbol＆＃39;作为索引并包括＆＃39;日期＆＃39;作为专栏。
我试过包括＆＃39;日期＆＃39;在字典和Symbol作为索引，但它导致索引需要是Datetime的错误。
这是我的代码：
if ( data_duration == 'w' ):
df['Date'] = pd.to_datetime(df['Date'])
df.set_index('Date', inplace=True)
df.sort_index(inplace=True)
def take_first(array_like):
return array_like[0]
def take_last(array_like):
return array_like[-1]
output = df.resample('W', # Weekly resample
how={'Open': take_first,
'High': 'max',
'Low': 'min',
'Close': take_last,
'Volume': 'sum'},
loffset=pd.offsets.timedelta(days=-6)) # to put the labels to Monday
df = output[['Open', 'High', 'Low', 'Close', 'Volume']]
但我希望将我的索引保留为＆＃39;符号＆＃39;，就像它在每日数据中一样，同时在＆＃39;输出＆＃39;中包含日期。
这就是每日数据的样子：
Date Close High Low Open Volume
Symbol
AAPL 2017-05-25 153.87 154.3500 153.0300 153.7300 19235598
AAPL 2017-05-26 153.61 154.2400 153.3100 154.0000 21927637
然而，在每周格式化之后，除了符号之外，一切都保持不变。我该如何解决这个问题？
答案 0 :(得分：1)
您想要class App extends Component {
state = {
cart: [],
items: [
{ id: uuid(), name: 'chocolate', price: 10, remaining: 5 },
{ id: uuid(), name: 'strawberry', price: 50, remaining: 10 },
{ id: uuid(), name: 'banana', price: 43, remaining: 20 }
],
total: 0,
addToCartMessage: false,
removeFromCartMessage: false,
searchTerm: ''
}
addItem = item => {
const { cart, items, total } = this.state
cart.push({ id: item.id, name: item.name, price: item.price })
const remaining = item.remaining--
const totalPrice = cart.reduce((a, b) => a + b.price, 0)
this.setState({
total: totalPrice,
cart,
addToCartMessage: true,
...items, remaining
})
}
removeItem = cartItems => {
const { items, cart, total } = this.state
const removeItem = cart.filter(item => item.id !== cartItems.id)
const itemId = items.find(item => item.name === cartItems.name).remaining++
this.setState({
removeFromCartMessage: true,
total: total - cartItems.price,
cart: removeItem,
...items, remaining: itemId
})
}
render() {
const { cart, items, total, addToCartMessage, removeFromCartMessage } =
this.state
if (addToCartMessage || removeFromCartMessage) {
setTimeout(() => {
this.setState({
addToCartMessage: false,
removeFromCartMessage: false
})
}, 1000)
}
const filteredItems = items.filter(item =>
item.name.includes(this.state.searchTerm))
return (
<div className="App">
{cart.length === 0 ? <h3>No items in cart</h3> : (
<div>
<h1>Cart:</h1>
{cart.map(items => (
<div key={items.id}>
<h1>{items.name} x 3</h1>
<p>${items.price}</p>
<button onClick={() => this.removeItem(items)}>Remove From Cart</button>
</div>
))}
</div>
)}
<hr />
<input
type="text"
placeholder="Search for an item..."
onChange={e => this.setState({ searchTerm: e.target.value })}
value={this.state.searchTerm}
/>
{filteredItems.map(item => (
<div key={item.id}>
<h1>{item.name}</h1>
<p>Price: ${item.price}</p>
{item.remaining === 0 ? <p>Sold Out</p> : (
<div>
<p>Remaining: {item.remaining}</p>
<button onClick={() => this.addItem(item)}>Add To Cart</button>
</div>
)}
</div>
))}
{ total !== 0 ? <h1>Total ${total}</h1> : <h1>Total $0</h1> }
{ addToCartMessage && <h1>Item successfully added!</h1> }
{ removeFromCartMessage && <h1>Item successfully removed!</h1> }
</div>
)
}
}
export default App
：https://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.unstack.html
它会将其中一个索引级别移动到DataFrame中的列。像这样：
unstack()