用anaconda写python生物信息学的代码，提示语法错误，VSC上指向的是“print”的“p”

如图，代码如下

import sys
import re
from typing import NamedTuple
from Bio import SeqIO
from Bio.Seq import Seq
from Bio.SeqRecord import SeqRecord
fn='data/fasta_example_data/small_ls_orchid.fasta'
seq_index=SeqIO.index(fn,'fasta')

chr_len={k:len(v.seq) for k,v in seq_index.items()}

n=len(chr_len)
total_len=sum(chr_len.values())
mean_len=total_len/n
(longest_id,longest_len)=max(chr_len.items(),key=lambda x:x[1])

def Nx0(l,x):
#该函数用于计算nx0，接受两个参数：
  #l长度列表
   #x：n50或n60等
  #返回两个值：
  #idx：nx0的编号
  #nx0：nx0的长度
    l=sorted(l,reverse=True)
    p=int(x[1:])/100
    total_len=sum(l)
    nx0=0
    idx=0
    cumsum=0#累加
    for i,v in enumerate(l,start=1):    #从1开始排序
      cumsum+=v
      if cumsum>=total_len * p:
        idx=i
        nx0=v
        break
    return idx,nx0

#n count 和 gaps:
n_count=0
gaps=0
for k,v in seq_index.items():
  s=v.seq#正则表达式只能用于字符串
  n_count+=s.cout('N')
  gaps+=len(re.split('N+',str(s))-1,

fi_name = fn.split('/')[-1]
print('stats for {}'.format(fi_name))
print('sum = {}, n = {}, ave = {}, largest = {}'\
  .format(total_len, n, mean_len, longest_id))
  
for n in ('N50', 'N60', 'N70', 'N80', 'N90', 'N100'):
  idx, nx0 = Nx0(chr_len.values(), n)
  print('{} = {}, n = {}'.format(n, nx0, idx))

print('count = {}'.format(n_count))
print('Gaps = {}'.format(gaps))

45行缺一个右括号