import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec
from matplotlib import figure

def figure_bug(file):
    fig = figure.Figure(figsize=(2,5), constrained_layout=True)
    gs = gridspec.GridSpec(5, 1, figure=fig)
    axs = [fig.add_subplot(gs[x]) for x in range(1, 5)] 
    fig.text(0.5, 0.5, file, fontsize=25)
    fig.savefig(file)
    plt.close(fig)

if __name__ == '__main__':
    for i in range(0, 110):
        file_name = f'{i}.png'
        figure_bug(file_name)
        print(f'Done {i}')

AttributeError Traceback (most recent call last)
D:\...\img_test\layou_test.py in <module>()
     14     for i in range(0, 110):
     15         file_name = f'{i}.png'
---> 16         figure_bug(file_name)
     17         print(f'Done {i}')

D:\....\img_test\layou_test.py in gridspec_bug(file)
      8     axs = [fig.add_subplot(gs[x]) for x in range(1, 5)]
      9     fig.text(0.5, 0.5, file, fontsize=25)
---> 10     fig.savefig(file)
     11     plt.close(fig)
     12

C:\....\matplotlib\figure.py in savefig(self, fname, frameon, transparent, **kwargs)
   2095             self.set_frameon(frameon)
   2096
-> 2097         self.canvas.print_figure(fname, **kwargs)
   2098
   2099         if frameon:

AttributeError: 'NoneType' object has no attribute 'print_figure'