使用Pandas api

Question

当我运行下面的代码时，我只获得了我的CSV文件的第一行（我的名字行）。我该怎么做才能确保下面的代码返回我的整个CSV？

em.executeQuery(query).then(function(data) {
     entities = data.results;
     entities.forEach(function(entity) {
         // post-initialize the entity
         // (it has already been merged into the cache)
     });
     return entities;
});

Answer 1

使用Pandas api

提供的read_csv功能

df = pd.read_csv('elves.csv')

Answer 2

返回总是立即退出循环。试试，例如。

def f():
    for i in range(100):
        return i

f()

你的流程应该是这样的：

with open('elves.csv') as csvjawn:
    readCS = csv.reader(csvjawn, delimiter = ',')
    data = [row for row in readCS]

这使用了一个列表理解，如果你以前没见过，你可能想要研究它。

Answer 3

我不会使用return来完成你想要做的事情。

stackoverflow的同事（abarnert）的回应：

with open('old.csv', 'rb') as oldf, open('new.csv', 'wb') as newf:
    old_reader = csv.reader(oldf)
    writer = csv.writer(newt)
    for row in old_reader:
        writer.writerow(transform(row))
with open('new.csv', 'rb') as newf:
    new_reader = csv.reader(newf)
    for row in new_reader:
        print row

url：CSV reader object not reading entire file [Python]

无法返回整个CSV数据框

3 个答案:

使用Pandas api