为什么会出现NameError：未定义全局名称'phase'

如何解决为什么会出现NameError：未定义全局名称'phase'

我正在尝试向绘图添加一些交互性，也就是说，单击鼠标左键应删除绘图中的数据点，而单击鼠标右键应以相反的顺序恢复删除的数据点。这是我的Python脚本的相关摘录：

def plot_folded_light_curve(best_frequency,method):
    x_time = np.asarray(x_period)
    phase = (x_time * best_frequency) % 1

    fig,ax = plt.subplots(figsize=(8,6))
    plt.subplots_adjust(left=0.25,bottom=0.25)

    blue_scatter = plt.scatter(phase,y_m0,color="blue",picker=10)

    # delete data points in the raw light curve plot by left-clicks
    def pick_handler(event):
        global phase
        if event.mouseevent.button==1:
            ind = event.ind
            print "Deleting data point:",ind[0],np.take(phase,ind[0]),np.take(y_m0,ind[0])
            deleted_phase.append(phase[ind[0]])
            phase_index.append(ind[0])
            phase = np.delete(phase,[ind[0]])
            deleted_y_m0.append(y_brightness[ind[0]])
            y_m0_index.append(ind[0])
            del y_m0[ind[0]]
            deleted_blocks_items.append(sorted(blocks[blocks.keys()[0]].items())[ind[0]])
            del blocks[blocks.keys()[0]][sorted(block)[ind[0]]]
            blue_scatter.set_offsets(phase,y_m0)
            fig.canvas.draw()

    # restore data points in the raw light curve plot by right-clicks
    def click_handler(event):
        global phase
        if event.button == 3:
            if len(deleted_phase) > 0:
                print "Restoring data point:",phase_index[-1],deleted_phase[-1],deleted_y_m0[-1]
                phase = np.insert(phase,phase_index.pop(),deleted_phase.pop())
                y_m0.insert(y_m0_index.pop(),deleted_y_m0.pop())
                blocks[blocks.keys()[0]].update([deleted_blocks_items[-1]])
                deleted_blocks_items.pop()
                blue_scatter.set_offsets(np.c_[phase,y_m0])
                fig.canvas.draw()
            else:
                print "No deleted data points left!"

    fig.canvas.mpl_connect('pick_event',pick_handler)
    fig.canvas.mpl_connect('button_press_event',click_handler)

运行脚本时，涉及到函数pick_handler()的调用，我收到一条错误消息：

  File "/usr/local/bin/apex_geo_lightcurve.py",line 624,in pick_handler
    print "Deleting data point:",ind[0])
NameError: global name 'phase' is not defined

我不明白为什么未定义？我究竟做错了什么？有人可以帮我吗？

这个可运行的测试脚本运行良好，但是：

import numpy as np
import matplotlib.pyplot as plt

x = np.asarray([1,3,5])
y = [2,4,6]

deleted_x = []
deleted_y = []
x_index= []
y_index= []

# delete data points in the raw light curve plot by left-clicks
def pick_handler(event):
    global x
    if event.mouseevent.button==1:
        ind = event.ind
        print ind
        print "Deleting data point:",np.take(x,np.take(y,ind[0])
        deleted_x.append(x[ind[0]])
        x_index.append(ind[0])
        x = np.delete(x,[ind[0]])
        deleted_y.append(y[ind[0]])
        y_index.append(ind[0])
        del y[ind[0]]
        blue_scatter.set_offsets(np.c_[x,y])
        fig.canvas.draw()

# restore data points in the raw light curve plot by right-clicks
def click_handler(event):
    global x
    if event.button == 3:
        if len(deleted_x) > 0:
            print "Restoring data point:",x_index[-1],deleted_x[-1],deleted_y[-1]
            x = np.insert(x,x_index.pop(),deleted_x.pop())
            y.insert(y_index.pop(),deleted_y.pop())
            blue_scatter.set_offsets(np.c_[x,y])
            fig.canvas.draw()
        else:
            print "No deleted data points left!"

fig,ax = plt.subplots()
blue_scatter = plt.scatter(x,y,picker=10)
fig.canvas.mpl_connect('pick_event',pick_handler)
fig.canvas.mpl_connect('button_press_event',click_handler)
plt.show()

顺便说一句，如果我理解正确的话，如果我在函数调用过程中简单地通过phase，那么我应该可以使用没有全局变量的全部内容，但是我不知道如何正确地做到这一点。情况。

解决方法

您正在运行Python 3吗？尝试使用nonlocal phase代替global phase。

问题在于您对phase的定义不是“全局”的，而是在我周围的函数定义中定义的。 global并不意味着“在我以外的地方定义”。它的真正含义是“在全局范围内定义”。

或者，您可以将global phase添加到plot_folded_light_curve中。这在Python2和Python3中都适用。它强制所有相的出现都是全局的。