：模板没有定义

Question

我使用下面的Python脚本：

import numpy as np 
import matplotlib.pyplot as plt 
import nibabel 
import os 

def collapse_probtrack_results(waytotal_file, matrix_file): 
    with open(waytotal_file) as f: 
     waytotal = int(f.read()) 
    data = nibabel.load(matrix_file).get_data() 
    collapsed = data.sum(axis=0)/waytotal * 100. 
    return collapsed 

matrix_template = 'results/{roi}.nii.gz.probtrackx2/matrix_seeds_to_all_targets.nii.gz' 
processed_seed_list = [s.replace('.nii.gz','').replace('label/', '') 
    for s in open('/home/salvatore/tirocinio/aal_rois_diff_space/aal.txt').read().split('\n') 
    if s] 
N = len(processed_seed_list) 
conn = np.zeros((N, N)) 
rois=[] 
idx = 0 
for roi in processed_seed_list: 
    matrix_file = template.format(roi=roi) 
    seed_directory = os.path.dirname(result) 
    roi = os.path.basename(seed_directory).replace('.nii.gz.probtrackx2', '') 
    waytotal_file = os.path.join(seed_directory, 'waytotal') 
    rois.append(roi) 
    try: 
     # if this particular seed hasn't finished processing, you can still 
     # build the matrix by catching OSErrors that pop up from trying 
     # to open the non-existent files 
     conn[idx, :] = collapse_probtrack_results(waytotal_file, matrix_file) 
    except OSError: 
     pass 
    idx += 1 

# figure plotting 
fig = plt.figure() 
ax = fig.add_subplot(111) 
cax = ax.matshow(conn, interpolation='nearest',) 
cax.set_cmap('hot') 
caxes = cax.get_axes() 

当我尝试运行它，我得到以下错误：NameError：名字“模板”没有定义。这指的是上面脚本的第22行。你能帮我弄清楚这是什么意思？

Answer 1

没有像template这样的变量，所以template不能用在表达式的右边。尝试

matrix_file = matrix_template.format(roi=roi) 

改为。