【发布时间】：2020-09-04 05:54:38
【问题描述】：
谁能解释一下为什么下面的代码会抛出 IndentationError。
我正在尝试绘制具有某种实时值的仪表。这段代码之前运行良好，现在当我重新启动系统时，相同的代码会引发错误。请解释错误。
%matplotlib inline
import os, sys
import matplotlib
from matplotlib import cm
from matplotlib import pyplot as plt
import numpy as np
from matplotlib.patches import Circle, Wedge, Rectangle
def degree_range(n):
start = np.linspace(0,180,n+1, endpoint=True)[0:-1]
end = np.linspace(0,180,n+1, endpoint=True)[1::]
mid_points = start + ((end-start)/2.)
yield np.c_[start, end], mid_points
def rot_text(ang):
rotation = np.degrees(np.radians(ang) * np.pi / np.pi - np.radians(90))
yield rotation
def gauge(labels=['LOW','MEDIUM','HIGH','VERY HIGH','EXTREME'],
colors='jet_r', arrow=1, title='', fname=False):
"""
some sanity checks first
"""
N = len(labels)
if arrow > N:
raise Exception("\n\nThe category ({}) is greated than \
the length\nof the labels ({})".format(arrow, N))
"""
if colors is a string, we assume it's a matplotlib colormap
and we discretize in N discrete colors
"""
if isinstance(colors, str):
cmap = cm.get_cmap(colors, N)
cmap = cmap(np.arange(N))
colors = cmap[::-1,:].tolist()
if isinstance(colors, list):
if len(colors) == N:
colors = colors[::-1]
else:
raise Exception("\n\nnumber of colors {} not equal \
to number of categories{}\n".format(len(colors), N))
"""
begins the plotting
"""
fig, ax = plt.subplots()
ang_range, mid_points = degree_range(N)
labels = labels[::-1]
"""
plots the sectors and the arcs
"""
patches = []
for ang, c in zip(ang_range, colors):
# sectors
patches.append(Wedge((0.,0.), .4, *ang, facecolor='w', lw=2))
# arcs
patches.append(Wedge((0.,0.), .4, *ang, width=0.10, facecolor=c, lw=2, alpha=0.5))
[ax.add_patch(p) for p in patches]
"""
set the labels (e.g. 'LOW','MEDIUM',...)
"""
for mid, lab in zip(mid_points, labels):
ax.text(0.35 * np.cos(np.radians(mid)), 0.35 * np.sin(np.radians(mid)), lab, \
horizontalalignment='center', verticalalignment='center', fontsize=14, \
fontweight='bold', rotation = rot_text(mid))
"""
set the bottom banner and the title
"""
r = Rectangle((-0.4,-0.1),0.8,0.1, facecolor='w', lw=2)
ax.add_patch(r)
ax.text(0, -0.05, title, horizontalalignment='center', \
verticalalignment='center', fontsize=22, fontweight='bold')
"""
plots the arrow now
"""
pos = mid_points[abs(arrow - N)]
ax.arrow(0, 0, 0.225 * np.cos(np.radians(pos)), 0.225 * np.sin(np.radians(pos)), \
width=0.04, head_width=0.09, head_length=0.1, fc='k', ec='k')
ax.add_patch(Circle((0, 0), radius=0.02, facecolor='k'))
ax.add_patch(Circle((0, 0), radius=0.01, facecolor='w', zorder=11))
"""
removes frame and ticks, and makes axis equal and tight
"""
ax.set_frame_on(False)
ax.axes.set_xticks([])
ax.axes.set_yticks([])
ax.axis('equal')
plt.tight_layout()
if fname:
fig.savefig(fname, dpi=200)
gauge(labels=['LOW','MEDIUM','HIGH'], \
colors=['r','y','g'], arrow=2, title='something here')
请帮助并解释我犯了什么错误？ 我已经检查了很多次身份，但仍然无法确定错误。
实际错误是：
> File "<tokenize>", line 91
> gauge(labels=['LOW','MEDIUM','HIGH'], \
> ^ IndentationError: unindent does not match any outer indentation level
【问题讨论】：
-
代码的最后三行都有不同的缩进。你知道 Python 中的块语法是如何工作的吗？
标签： python-3.x matplotlib data-visualization