Python函数必须先定义,后调用说明(函数调用函数例外)

# 此代码主要为说明问题，后面我会贴上完整代码以及数据。
def cal_simi(n):
 file = os.popen('cd '+path[n-1]+';ls').readlines()
 RMSD_simi = []
 TMscore_simi = []
 MasSubscore_simi = []
 GDTTSscore_simi = []
 GDTHAscore_simi = []
 for fileName1 in file:
  temp1 = [];temp2=[];temp3=[];temp4=[];temp5=[]
  for fileName2 in file:
   comm = 'cd /home/stern/Desktop/TMscore;' + 'sudo ./TMscore ' + path[n-1] + fileName1[:-1] +' '+ path[n-1] + fileName2[:-1]
   # storge the result of the command in data
   data = os.popen(comm).readlines()
   temp1.append(data[14][32:38]);temp2.append(data[16][14:20]);temp3.append(data[17][14:20])
   temp4.append(data[18][14:20]);temp5.append(data[19][14:20])
  RMSD_simi.append(temp1)
  TMscore_simi.append(temp2)
  MasSubscore_simi.append(temp3)
  GDTTSscore_simi.append(temp4)
  GDTHAscore_simi.append(temp5)
  p1 = np.median(RMSD_simi);p2 = np.median(TMscore_simi);p3 = np.median(MasSubscore_simi)
  p4 = np.median(GDTTSscore_simi);p5 = np.median(GDTHAscore_simi)
  for i in range(len(file)):
   RMSD_simi[i][i] = p1
   TMscore_simi[i][i] = p2
   MasSubscore_simi[i][i] = p3
   GDTTSscore_simi[i][i] = p4
   GDTHAscore_simi[i][i] = p5     
 return RMSD_simi,TMscore_simi,MasSubscore_simi,GDTTSscore_simi,GDTHAscore_simi
Xn = ['1abv_','1af7_','1cqkA','1csp_','1dcjA','256bA']
path = ['/home/stern/Desktop/1abv_/','/home/stern/Desktop/1af7_/','/home/stern/Desktop/1cqkA/',
 '/home/stern/Desktop/1csp_/','/home/stern/Desktop/1dcjA/','/home/stern/Desktop/256bA/']
# fsadf
RMSD_simi1 = []
TMscore_simi1 = []
MasSubscore_simi1 = []
GDTTSscore_simi1 = []
GDTHAscore_simi1 = []

RMSD_simi1,TMscore_simi1,MasSubscore_simi1,GDTTSscore_simi1,GDTHAscore_simi1=cal_simi(1)
print RMSD_simi1[1][1]
print TMscore_simi1[2][2]
print MasSubscore_simi1[3][3]
print GDTTSscore_simi1[4][4]
print GDTHAscore_simi1[5][5]

Xn = ['1abv_','1af7_','1cqkA','1csp_','1dcjA','256bA']
 File "<stdin>", line 30
 Xn = ['1abv_','1af7_','1cqkA','1csp_','1dcjA','256bA']
  ^
SyntaxError: invalid syntax
>>> path = ['/home/stern/Desktop/1abv_/','/home/stern/Desktop/1af7_/','/home/stern/Desktop/1cqkA/',
...  '/home/stern/Desktop/1csp_/','/home/stern/Desktop/1dcjA/','/home/stern/Desktop/256bA/']