我是使用argparse的新手，在这种情况下我必须使用它，因为代码将通过终端运行。我希望用户能够在终端中输入bin大小，然后程序将绘制直方图。如果我使用输入语句，代码工作正常但是我在使用argparse时遇到问题。这是目前的代码。
from matplotlib import pyplot as plt
import numpy as np
import argparse
import sys
fh = open('dummy2.pepmasses')
values = []
for line in fh:
data = line.split()
protname, pep, mz, z, p, sequence = data
mz = float(mz)
#print(mz)
values.append(mz)
parser = argparse.ArgumentParser()
parser.add_argument('-s', '--Bin_size', type=int, metavar='', required=True, help='Size of bin, multiple of 100 between 100-1000')
args = parser.parse_args()
def Histogram(Bin_size):
if Bin_size ==100:
bins = [0, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900, 4000, 4100, 4200, 4300, 4400, 4500, 4600, 4700, 4800, 4900, 5000, 5100, 5200, 5300, 5400, 5500, 5600, 5700, 5800, 5900, 6000, 6100]
elif Bin_size ==200:
bins = [0, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000, 3200, 3400, 3600, 3800, 4000, 4200, 4400, 4600, 4800, 5000, 5200, 5400, 5600, 5800, 6000, 6200]
elif Bin_size ==300:
bins = [0, 300, 600, 900, 1200, 1500, 1800, 2100, 2400, 2700, 3000, 3300, 3600, 3900, 4200, 4500, 4800, 5100, 5400, 5700, 6000, 6300]
elif Bin_size ==400:
bins= [0, 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600, 4000, 4400, 4800, 5200, 5600, 6000, 6400]
elif Bin_size ==500:
bins = [0, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 5500, 6000, 6500]
elif Bin_size ==600:
bins = [0, 600, 1200, 1800, 2400, 3000, 3600, 4200, 4800, 5400, 6000, 6600]
elif Bin_size ==700:
bins = [0, 700, 1400, 2100, 2800, 3500, 4100, 4900, 5600, 6300]
elif Bin_size ==800:
bins = [0, 800, 1600, 2400, 3200, 4000, 4800, 5600, 6400]
elif Bin_size ==900:
bins = [0, 900, 1800, 2700, 3600, 4500, 5400, 6300]
elif Bin_size ==1000:
bins = [0, 1000, 2000, 3000, 4000, 5000, 6000, 7000]
else:
print("Invalid bin size, please enter a multiple of 100 between 100-1000")
if Bin_size ==100 or Bin_size==200 or Bin_size==300 or Bin_size==400 or Bin_size==500 or Bin_size==600 or Bin_size==700 or Bin_size==800 or Bin_size==900 or Bin_size==1000:
plt.hist(values, bins, histtype='bar', rwidth=0.8)
plt.xlabel('m/z value')
plt.ylabel('Number of proteins')
plt.title('Histogram of mz')
plt.legend('Bins')
plt.show()
if __name__ == '__main__':
Histogram(args.Bin_size)
这会返回以下错误：
Traceback (most recent call last):
File "project_test.py", line 54, in <module>
Histogram(args.Bin_size)
File "project_test.py", line 46, in Histogram
plt.hist(values, bins, histtype='bar', rwidth=0.8)
File "/usr/local/lib/python3.5/dist-packages/matplotlib/pyplot.py", line 3066, in hist
ax = gca()
File "/usr/local/lib/python3.5/dist-packages/matplotlib/pyplot.py", line 950, in gca
return gcf().gca(**kwargs)
File "/usr/local/lib/python3.5/dist-packages/matplotlib/pyplot.py", line 586, in gcf
return figure()
File "/usr/local/lib/python3.5/dist-packages/matplotlib/pyplot.py", line 535, in figure
**kwargs)
File "/usr/local/lib/python3.5/dist-packages/matplotlib/backends/backend_tkagg.py", line 81, in new_figure_manager
return new_figure_manager_given_figure(num, figure)
File "/usr/local/lib/python3.5/dist-packages/matplotlib/backends/backend_tkagg.py", line 89, in new_figure_manager_given_figure
window = Tk.Tk()
File "/usr/lib/python3.5/tkinter/__init__.py", line 1871, in __init__
self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: no display name and no $DISPLAY environment variable
我甚至无法理解这个错误的含义。任何帮助将不胜感激。