统计文件中以P开头的总行数

count = 0
with open('data.txt', 'r') as f:
    data = f.read().split('\n')
    for i in data:
        if i[0]=='P':
            count += 1
print(count)

count=0
with open('data.txt','r')as f:
for line in f.readlines():
if line.startswith('P'):
count+=1

if Line[0]=='P' :count+=1