如何使用 pandas 清理坐标系统的CSV文件? [英] How to clean CSV file for a coordinate system using pandas?
本文介绍了如何使用 pandas 清理坐标系统的CSV文件?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想创建一个程序来将CSV文件转换为DXF(AutoCAD),但是CSV文件有时带有标头,有时没有,并且有些单元格不能为空,例如坐标,并且我还注意到排除后一些输入的值是nan或NaN,有必要删除它们,所以我为您提供答案,请分享您的意见以实施更好的方法.
I wanted to create a program to convert CSV files to DXF(AutoCAD), but the CSV file sometimes comes with a header and sometimes no and there are cells that cannot be empty such as coordinates, and I also noticed that after excluding some of the inputs the value is nan or NaN and it was necessary to get rid of them so I offer you my answer and please share your opinions to implement a better method.
示例输入
输出
推荐答案
解决方案
import string
import pandas
def pandas_clean_csv(csv_file):
"""
Function pandas_clean_csv Documentation
- I Got help from this site, it's may help you as well:
Get the row with the largest number of missing data for more Documentation
https://moonbooks.org/Articles/How-to-filter-missing-data-NAN-or-NULL-values-in-a-pandas-DataFrame-/
"""
try:
if not csv_file.endswith('.csv'):
raise TypeError("Be sure you select .csv file")
# get punctuations marks as list !"#$%&'()*+,-./:;<=>?@[\]^_`{|}~
punctuations_list = [mark for mark in string.punctuation]
# import csv file and read it by pandas
data_frame = pandas.read_csv(
filepath_or_buffer=csv_file,
header=None,
skip_blank_lines=True,
error_bad_lines=True,
encoding='utf8',
na_values=punctuations_list
)
# if elevation column is NaN convert it to 0
data_frame[3] = data_frame.iloc[:, [3]].fillna(0)
# if Description column is NaN convert it to -
data_frame[4] = data_frame.iloc[:, [4]].fillna('-')
# select coordinates columns
coord_columns = data_frame.iloc[:, [1, 2]]
# convert coordinates columns to numeric type
coord_columns = coord_columns.apply(pandas.to_numeric, errors='coerce', axis=1)
# Find rows with missing data
index_with_nan = coord_columns.index[coord_columns.isnull().any(axis=1)]
# Remove rows with missing data
data_frame.drop(index_with_nan, 0, inplace=True)
# iterate data frame as tuple data
output_clean_csv = data_frame.itertuples(index=False)
return output_clean_csv
except Exception as E:
print(f"Error: {E}")
exit(1)
out_data = pandas_clean_csv('csv_files/version2_bad_headers.csl')
for i in out_data:
print(i[0], i[1], i[2], i[3], i[4])
在这里您可以下载我的测试CSV 文件
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