Question

我正在尝试编写一个代码，从外部文件读取一组这样的值：

   4.87320984E-09               1       49.882684417026184            0.18691906898647714            0.22222662961584136
   1.88917193E-09               2       49.882684417026184            0.18691906898647714            0.22222662961584136
   1.30942168E-09               3       49.882684417026184            0.18691906898647714            0.22222662961584136
   7.26580629E-10               4       49.882684417026184            0.18691906898647714            0.22222662961584136
   5.39025047E-10               5       49.882684417026184            0.18691906898647714            0.22222662961584136
   2.04686401E-08               1       68.253977742324736            -5.0977927905402787E-002       0.32783928527485512
   3.08666603E-09               3       68.253977742324736            -5.0977927905402787E-002       0.32783928527485512
   2.88387625E-09               4       68.253977742324736            -5.0977927905402787E-002       0.32783928527485512
   1.15430343E-09               5       68.253977742324736            -5.0977927905402787E-002       0.32783928527485512

我想将每列都存储在列表中，然后用它们做一些数学运算。

import sys
inFile = sys.argv[1]
c1 = []
c2 = []
c3 = []
c4 = []
c5 = []
data = [c1,c2,c3,c4,c5]

with open(inFile,'r') as i:
   lines = i.read().split('\n')
for row in lines:
   #split in columns and do some maths
print data

Answer 1

with open("inFile",'r') as dataFile:
   for i in dataFile.readlines():
       print i.split()

<强>输出：

['4.87320984E-09', '1', '49.882684417026184', '0.18691906898647714', '0.22222662961584136']
['1.88917193E-09', '2', '49.882684417026184', '0.18691906898647714', '0.22222662961584136']
['1.30942168E-09', '3', '49.882684417026184', '0.18691906898647714', '0.22222662961584136']
['7.26580629E-10', '4', '49.882684417026184', '0.18691906898647714', '0.22222662961584136']
['5.39025047E-10', '5', '49.882684417026184', '0.18691906898647714', '0.22222662961584136']
['2.04686401E-08', '1', '68.253977742324736', '-5.0977927905402787E-002', '0.32783928527485512']
['3.08666603E-09', '3', '68.253977742324736', '-5.0977927905402787E-002', '0.32783928527485512']
['2.88387625E-09', '4', '68.253977742324736', '-5.0977927905402787E-002', '0.32783928527485512']
['1.15430343E-09', '5', '68.253977742324736', '-5.0977927905402787E-002', '0.32783928527485512']

Answer 2

import pandas as pd

inFile = YOUR_CSV.csv
df = pd.read_csv(inFile)
print(df.head(3) #prints first 3 rows to check your data

Answer 3

我肯定会推荐Pandas来完成这项任务。这样的事情应该有效

decLen = 3
decLen = 6
decLen = 0

delimiter参数指示它将一个或多个空白字符视为分隔符。对于示例中显示的数据，它应该可以工作。

Answer 4

很多人推荐大熊猫，但由于这些数据只包含数字，你可能只想考虑numpy。这里有一个很好的教程：https://www.dataquest.io/blog/numpy-tutorial-python/。

以下是如何导入数据的示例。从那里你可以使用完整的numpy库来对你的数组进行数学运算或大量运算。有关详细信息，请参阅我发布的教程。

import numpy as np

file = 'path_to_your_file.csv'

data_array = np.genfromtxt(file, delimiter=',')

Answer 5

以下是您要查找的代码：

cluster

但我建议使用Pandas read_csv方法。

在python中的列中拆分数据

5 个答案: