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よく使うPythonコード 

Last updated at Posted at 2021-02-19

#基本的なライブラリ

import cv2
import numpy as np
from matplotlib import pyplot as plt
import pandas as pd

#配列変換

#ndarray→list
arr_2d = np.arange(6).reshape((2, 3))
# [[0 1 2]
#  [3 4 5]]
list_2d = arr_2d.tolist()
# [[0, 1, 2], [3, 4, 5]]

#listに変換
test = list(test)

#list→pd
test = pd.Series(test)#1列
test_pd = pd.DataFrame(test)#2列以上

#pd→list
test = test.values.tolist()

#データ型変換

#文字列→数字
test = "test"
test2 = float(test)

#数字→文字列
test = 100
test2 = str(test)

#CSVファイル系

#csvファイル読み込み
csv = pd.read_csv('csv.csv',header=None)#ファイルの中身そのまま読み込みたい場合

#csv出力
test.to_csv("test.csv",  header=False, index=False)#header, index 指定しない場合

#csvトリミング
test = test.iloc[y_min:y_max,x_min:x_max]

#pd変換
test_pd = pd.DataFrame(test)
result = pd.concat([test_pd1, test_pd2], axis=1)#列を横に連結

#csvデータ名を定義
X=X.rename(columns={0:'X'})
X.to_csv("test.csv")#header, index 指定する場合

#リスト

list = []
list.append(test)
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