Question

有许多使用python读取csv数据的例子，如下所示：

import csv
with open('some.csv', newline='') as f:
  reader = csv.reader(f)
  for row in reader:
    print(row)

我只想读取一行数据并将其输入各种变量。我怎么做？我到处寻找一个有效的例子。

我的代码只检索i的值，而不检索其他值

reader = csv.reader(csvfile, delimiter=',', quotechar='"')
for row in reader:
  i = int(row[0])
  a1 = int(row[1])
  b1 = int(row[2])
  c1 = int(row[2])
  x1 = int(row[2])
  y1 = int(row[2])
  z1 = int(row[2])

Answer 1

要只阅读csv文件的第一行，请使用阅读器对象上的next()。

with open('some.csv', newline='') as f:
  reader = csv.reader(f)
  row1 = next(reader)  # gets the first line
  # now do something here 
  # if first row is the header, then you can do one more next() to get the next row:
  # row2 = next(f)

或：

with open('some.csv', newline='') as f:
  reader = csv.reader(f)
  for row in reader:
    # do something here with `row`
    break

Answer 2

你可以得到第一行，如：

with open('some.csv', newline='') as f:
  csv_reader = csv.reader(f)
  csv_headings = next(csv_reader)
  first_line = next(csv_reader)

Answer 3

您可以使用Pandas库从巨大的数据集中读取前几行。

import pandas as pd

data = pd.read_csv("names.csv", nrows=1)

您可以在nrows参数中提及要读取的行数。

Answer 4

来自Python documentation：

虽然模块不直接支持解析字符串，但可以轻松完成：

import csv
for row in csv.reader(['one,two,three']):
    print row

将字符串数据放入单例列表中。

Answer 5

获取csv文件中任何行的简单方法

import csv
csvfile = open('some.csv','rb')
csvFileArray = []
for row in csv.reader(csvfile, delimiter = '.'):
    csvFileArray.append(row)
print(csvFileArray[0])

Answer 6

仅供参考，在获取第一行以获取文件的其余部分之后，可以使用for循环：

with open('file.csv', newline='') as f:
    reader = csv.reader(f)
    row1 = next(reader)  # gets the first line
    for row in reader:
        print(row)       # prints rows 2 and onward

Answer 7

要打印行的范围，在这种情况下，是从第4行到第7行
import csv

with open('california_housing_test.csv') as csv_file:
    data = csv.reader(csv_file)
    for row in list(data)[4:7]:
        print(row)

如何在Python中读取一行csv数据？

7 个答案: