我有一个带有学生证的表格和学生已读过的幻灯片页面。 现在,我需要打印出那些阅读200多张幻灯片的学生,并计算出其中的几张。我尝试将csv导入列表和字典。 我发现无法像从C语言中学到的那样使用if和while循环。
#1
import csv
f = open('student_example.csv','r')
for row in csv.reader(f):
with open('student_example.csv', mode='w') as outfile:
writer = csv.writer(outfile)
[k,v] = row
f[k] = v
k = 0
print (f[2])
while k < 71: #There are 71 students
k += 1
if f[k] >= 200:
print (f[k])
#2
import csv
with open('student_example.csv', mode='r') as infile:
reader = csv.reader(infile)
with open('student_example_new.csv', mode='w') as outfile:
writer = csv.writer(outfile)
mydict = {rows[0]:rows[1] for rows in reader}
print(len(mydict))
k = 200
for rows[1] > k in reader:
print(rows[1])
样本输出应为: 通过了13名学生:dict_keys(['B046060035','B064020028','B064020052','B064030002','B065040041, 'B066060019','B066090002','B073040038','B074020003','B074020024','B074020043','B074020053','B074020055'])
答案 0 :(得分:0)
使用您的第一次尝试,您可以通过这种方式进行操作。 您想打开自己的文件,然后遍历学生。 如果> 200
,请检查每位学生他们读了多少张幻灯片并将其写入outfileimport csv
f = open('student_example.csv','r')
with open('student_example.csv', mode='w') as outfile:
writer = csv.writer(outfile)
for row in csv.reader(f):
[student_id, slides] = row
if slides > 200:
writer.writerow(student_id)
print (student_id)