将numpy.float64打印并转换为字符串的正确/可接受方式是什么？我注意到只使用print或str()会失去一些精确度。但是，repr保持完整的精度。例如：
>>> import numpy
>>> print numpy.float64('6374.345407799015')
6374.3454078
>>> print repr(numpy.float64('6374.345407799015'))
6374.3454077990154
我假设只是调用print会在float64对象上调用str()。 numpy.float64的__str__()是用'%s' % (float(self))实现的，或者以某种方式使用Python的内置float()来转换float64？我试图快速浏览一下numpy来源，但并不是很明显发生了什么。
我一直以为repr()应该返回eval()可以用来重新创建对象的有效Python代码。这是一个公认的惯例吗？幸运的是，在这种情况下，numpy不遵循此约定，因为repr()仅将原始数字作为字符串返回，而不是像"numpy.float64('6374.345407799015')"那样返回。
所以，所有这些让我感到困惑。将numpy.float64转换为字符串和/或打印它的正确方法是什么，同时保证始终具有相同的完全精度？
答案 0 :(得分：8)
<?php add_action('admin_init', 'pre_add_meta_boxes', 2);
function pre_add_meta_boxes() {
add_meta_box( 'preinvoice-group', 'Invoice Line Item', 'pre_repeatable_meta_box_display', 'pre_mentor_invoices', 'normal', 'default');
}
function pre_repeatable_meta_box_display() {
global $post;
$preinvoice_group = get_post_meta($post->ID, 'preinvoice_group', true);
wp_nonce_field( 'pre_repeatable_meta_box_nonce', 'pre_repeatable_meta_box_nonce' );
?>
<script type="text/javascript">
jQuery(document).ready(function( $ ){
$( '#add-row' ).on('click', function() {
var row = $( '.empty-row.screen-reader-text' ).clone(true);
row.removeClass( 'empty-row screen-reader-text' );
row.insertBefore( '#repeatable-fieldset-one tbody>tr:last' );
return false;
});
$( '.remove-row' ).on('click', function() {
$(this).parents('tr').remove();
return false;
});
});
jQuery('#pre_invoice_discount_percent').val();
jQuery('#formated_total').val(0);
jQuery('#pre_Discount_Total').val();
function updateTotal(discount) {
var discount = parseFloat(jQuery('#pre_invoice_discount_percent').val());
var subtotal = 0.00;
var total = 0.00;
var list = document.getElementsByClassName("custome_prices");
for(var i = 0; i < list.length; ++i) {
subtotal1 = (subtotal + parseFloat(list[i].value));
subtotal = subtotal1;
}
discountAmt = ((subtotal*discount)/100).toFixed(2);
total = (subtotal - discountAmt).toFixed(2);
var pre_final = parseFloat(jQuery("#formated_total").val(subtotal));
jQuery("#pre_Discount_Total").val(total);
jQuery("#pre_grand_Total").val(subtotal.toFixed(2));
}
</script>
<script>
jQuery('#pre_invoice_discount_percent').on( 'change',function (){
updateTotal();
});
</script>
<table id="repeatable-fieldset-one" width="100%">
<tbody>
<?php
if ( $preinvoice_group ) :
foreach ( $gpminvoice_group as $field ) {
?>
<tr>
<td>Invoice Item
<input type="text" style="width:80%;" name="invoiceItem[]" value="<?php if($field['invoiceItem'] != '') echo esc_attr( $field['invoiceItem'] ); ?>" /></td>
<td>Invoice Price
<input type="text" style="width:80%;" onchange='updateTotal();' class="widefat custome_prices" name="price[]" value="<?php if ($field['price'] != '') echo esc_attr( $field['price'] ); ?>" /></td>
<td><a class="button remove-row" href="#1">Remove</a></td>
</tr>
<?php
}
else :
// show a blank one
?>
<tr>
<td>Invoice Item
<input type="text" style="width:80%;" name="invoiceItem[]" /></td>
<td>Invoice Price
<input type="text" style="width:80%;" id="input" class="widefat custome_prices" name="price[]" onchange='updateTotal();' value="0.00" onfocus="(this.value == '0.00') && (this.value = '')"
onblur="(this.value == '') && (this.value = '0.00')" placeholder="0.00" /></td>
<td><a class="button cmb-remove-row-button button-disabled" href="#">Remove</a></td>
</tr>
<?php endif; ?>
<!-- empty hidden one for jQuery -->
<tr class="empty-row screen-reader-text">
<td>Invoice Item
<input type="text" style="width:80%;" name="invoiceItem[]"/></td>
<td>Invoice Price
<input type="text" style="width:80%;" class="widefat custome_prices" name="price[]" onchange='updateTotal();' value="0.00" onfocus="(this.value == '0.00') && (this.value = '')"
onblur="(this.value == '') && (this.value = '0.00')" placeholder="0.00"/></td>
<td><a class="button remove-row" href="#">Remove</a></td>
</tr>
</tbody>
</table>
<p><a id="add-row" class="button" href="#">Add another</a></p>
<div class="invoice_status">
<div class="cmb-th">
<label for="pre_invoice_status">Invoice Status</label>
</div>
<div class="cmb-td">
<ul class="cmb2-radio-list cmb2-list">
<li>
<input type="hidden" style="width:80%;" id="formated_total" name="formated_total"/>
<?php $pre_invoice_status = get_post_meta($post->ID, 'pre_invoice_status', true);?>
<input type="radio" class="cmb2-option" name="pre_invoice_status" id="pre_invoice_status" value="standard" <?php if($pre_invoice_status=='standard'){ ?>checked="checked"<?php }?> <?php if($pre_invoice_status!='standard'||$pre_invoice_status!='custom'){ ?>checked="checked"<?php }?>>
<label for="pre_invoice_status">Pending</label>
</li>
<li>
<input type="radio" class="cmb2-option" name="pre_invoice_status" id="pre_invoice_status" <?php if($pre_invoice_status=='custom'){ ?>checked="checked"<?php }?> value="custom">
<label for="pre_invoice_status">Paid</label>
</li>
</ul>
</div>
<div class="clearfix"></div>
</div>
<?php
}
add_action('save_post', 'pre_repeatable_meta_box_save');
function pre_repeatable_meta_box_save($post_id) {
if ( ! isset( $_POST['pre_repeatable_meta_box_nonce'] ) ||
! wp_verify_nonce( $_POST['pre_repeatable_meta_box_nonce'], 'pre_repeatable_meta_box_nonce' ) )
return;
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
return;
if (!current_user_can('edit_post', $post_id))
return;
$old = get_post_meta($post_id, 'preinvoice_group', true);
$new = array();
$invoiceItems = $_POST['invoiceItem'];
$prices = $_POST['price'];
$count = count( $invoiceItems );
for ( $i = 0; $i < $count; $i++ ) {
if ( $invoiceItems[$i] != '' ) :
$new[$i]['invoiceItem'] = stripslashes( strip_tags( $invoiceItems[$i] ) );
$new[$i]['price'] = stripslashes( $prices[$i] ); // and however you want to sanitize
endif;
}
if ( !empty( $new ) && $new != $old )
update_post_meta( $post_id, 'preinvoice_group', $new );
elseif ( empty($new) && $old )
delete_post_meta( $post_id, 'preinvoice_group', $old );
$pre_invoice_status= $_REQUEST['pre_invoice_status'];
update_post_meta( $post_id, 'pre_invoice_status', $pre_invoice_status );
}
方法效果很好：
astype答案 1 :(得分：5)
查看numpy.set_printoptions。具体来说，
numpy.set_printoptions(precision=15)