Category: Python

import urllib.request as req
local = "mushroom.csv"
url = "https://archive.ics.uci.edu/ml/machine-learning-databases/mushroom/agaricus-lepiota.data"
req.urlretrieve(url, local)
print("ok")

import random

def calc_bmi(h, w):
bmi = w / (h / 100) ** 2
if bmi < 18.5: return "thin" if bmi < 25: return "normal" return "fat" fp = open("bmi.csv", "w", encoding="utf-8") fp.write("height, weight, label\r\n") cnt = {"thin":0, "normal":0, "fat":0} for i in range(20000): h = random.randint(120, 200) w = random.randint(35, 80) label = calc_bmi(h, w) cnt[label] += 1 fp.write("{0},{1},{2}\r\n".format(h, w, label)) fp.close() print("ok", cnt) [/python] [python] from sklearn import cross_validation, svm, metrics import matplotlib.pyplot as plt import pandas as pd tbl = pd.read_csv("bmi.csv") label = tbl["label"] w = tbl["weight"] / 100 h = tbl["height"] / 200 wh = pd.concat([w, h], axis=1) data_train, data_test, label_train, label_test = \ cross_validation.train_test_split(wh, label) clf = svm.SVC() clf.fit(data_train, label_train) predict = clf.predict(data_test) ac_score = metrics.accuracy_score(label_test, predict) cl_report = metrics.classification_report(label_test, predict) print("正解率=", ac_score) print("レポート=\n", cl_report) [/python] [python] import matplotlib.pyplot as plt import pandas as pd tbl = pd.read_csv("bmi.csv", index_col=2) fig = plt.figure() ax = fig.add_subplot(1, 1, 1) def scatter(lbl, color): b = tbl.loc[lbl] ax.scatter(b["weight"],b["height"], c=color, label=lbl) scatter("fat", "red") scatter("normal", "yellow") scatter("thin", "purple") ax.legend() plt.savefig("bmi-test.png") [/python]

import urllib.request as req
import gzip, os, os.path

savepath = "./mnist"
baseurl = "http://yann.lecun.com/exdb/mnist"
files = [
	"train-images-idx3-ubyte.gz",
	"train-labels-idx1-ubyte.gz",
	"t10k-images-idx3-ubyte.gz",
	"t10k-labels-idx1-ubyte.gz"]

if not os.path.exists(savepath): os.mkdir(savepath)
for f in files:
	url = baseurl + "/" + f
	loc = savepath = "/" + f
	print("download:", url)
	if not os.path.exists(loc):
		req.urlretrieve(url, loc)

for f in files:
	gz_file = savepath + "/" + f
	raw_file = savepath + "/" + f.replace(".gz", "")
	print("gzip:", f)
	with gzip.open(gz_file, "rb") as fp:
		body = fp.read()
		with open(raw_file, "wb") as w:
			w.write(body)
print("ok")

[vagrant@localhost python]$ python3 app.py
download: http://yann.lecun.com/exdb/mnist/train-images-idx3-ubyte.gz
Traceback (most recent call last):
File “app.py”, line 18, in
req.urlretrieve(url, loc)
File “/home/vagrant/.pyenv/versions/3.5.2/lib/python3.5/urllib/request.py”, line 198, in urlretrieve
tfp = open(filename, ‘wb’)
PermissionError: [Errno 13] Permission denied: ‘/train-images-idx3-ubyte.gz’

何故だ！？

from sklearn import svm, metrics
import glob, os.path, re, json

def check_freq(fname):
name = os.path.basename(fname)
lang = re.match(r’^[a-z]{2,}’, name).group()
wtih open(fname, “r”, encoding=”utf-8″) as f:
text = f.read()
text = text.lower()
cnt = [0 for n in range(0, 26)]
code_a = ord(“a”)
code_z = ord(“z”)
for ch in text:
n = ord(ch)
if code_a <= n <= code_z: cnt[n - code_a] += 1 total = sum(cnt) freq = list(map(lambda n: n / total, cnt)) return (freq, lang) def load_files(path): freqs = [] labels = [] file_list = glob.glob(path) for fname in file_list: r = check_freq(fname) freqs.append(r[0]) labels.append(r[1]) return {"freqs":freqs, "labels":labels} data = load_files("./lang/train/*.txt") test = load_files("./lang/test/*.txt") with open("./lang/freq.json", "w", encoding="utf-8") as fp: json.dump([data, test], fp) clf = svm.SVC() clf.fit(data["freqs"], data["labels"]) predict = clf.predict(test["freqs"]) sc_score = metrics.accuracy_score(test["labels"], predict) cl_report = metrics.classification_report(test["labels"], predict) print("正解率=", ac_score) print("レポート=") print(cl_report) [/python] [python] import matplotlib.pyplot as plt import pandas as pd import json with open("./lang/freq.json", "r", encoding="utf-8") as fp: freq = json.load(fp) lang_dic = {} for i, lbl in enumerate(freq[0]["labels"]): fq = freq[0]["freqs"][i] if not (lbl in lang_dic): lang_dic[lbl] = fq continue for idx, v in enumerate(fq): lang_dic[lbl][idx] = (lang_dic[lbl][idx] + v) / 2 asclist = [[chr(n) for n in range(97,97+26)]] df = pd.DataFrame(lang_dic, index=asclist) plt.style.use('ggplot') df.plot(kind="bar", subplots=True, ylim=(0,0.15)) plt.savefig("lang-plot.png") [/python] [python] from sklearn import svm from sklearn.externals import joblib import json with open("./lang/freq.json", "r", encoding="utf-8") as fp: d = json.load(fp) data = d[0] clf = svm.SVC() clf.fit(data["freqs"], data["labels"]) joblib.dump(clf, "./cgi-bin/freq.pkl") print("ok") [/python]

GitHubからcsvをダウンロードします
https://github.com/pandas-dev/pandas/tree/master/pandas/tests/data

from sklearn import svm, metrics
import random, re

csv = []
with open(‘iris.csv’, ‘r’, encoding=’utf-8′) as fp:
for line in fp:
line = line.strip()
cols = line.split(‘,’)
fn = lambda n : float(n) if re.match(r’^[0-9\.]+$’, n) else n
cols = list(map(fn, cols))
csv.append(cols)

del csv[0]

random.shuffle(csv)

total_len = len(csv)
train_len = int(total_len * 2 / 3)
train_data = []
train_label = []
test_data = []
test_label = []
for i in range(total_len):
data = csv[i][0:4]
label = csv[i][4]
if i < train_len: train_data.append(data) train_label.append(label) else: test_data.append(data) test_label.append(label) clf = svm.SVC() clf.fit(train_data, train_label) pre = clf.predict(test_data) ac_score = metrics.accuracy_score(test_label, pre) print("正解率=", ac_score) [/python] [vagrant@localhost python]$ python3 app.py return f(*args, **kwds) 正解率= 0.96 [python] import pandas as pd from sklearn import svm, metrics, cross_validation csv = pd.read_csv('iris.csv') csv_data = csv[["SepalLength","SepalWidth","PetalLength","PetalWidth"]] csv_label = csv["Name"] train_data, test_data, train_label, test_label = \ cross_validation.train_test_split(csv_data, csv_label) clf = svm.SVC() clf.fit(train_data, train_label) pre = clf.predict(test_data) ac_score = metrics.accuracy_score(test_label, pre) print("正解率=", ac_score) [/python] [vagrant@localhost python]$ python3 app.py 正解率= 0.9736842105263158

from sklearn import datasets

digits = datasets.load_digits()

import matplotlib.pyplot as plt
plt.matshow(digits.images[0], cmap="Greys")
plt.show()

[vagrant@localhost python]$ python3 app.py
…
import _tkinter # If this fails your Python may not be configured for Tk
ImportError: No module named ‘_tkinter’

pyenv上python3.5.2環境でtkinterを利用できるようにしないといけないということですね。

まず、pip3でtinydbを入れる
[vagrant@localhost python]$ pip3 install tinydb
Collecting tinydb
Downloading https://files.pythonhosted.org/packages/97/6c/fb150f2c09d8b6f23b8f080396673794f970fa7ca0d50900fbe5fe07b8b9/tinydb-3.10.0-py2.py3-none-any.whl
Installing collected packages: tinydb
Successfully installed tinydb-3.10.0

続いて、python

from tinydb import TinyDB, Query

filepath = "test-tynydb.json"
db = TinyDB(filepath)

db.purge_table('fruits')

table = db.table('fruits')

table.insert({'name':'Banana', 'price':600})
table.insert({'name':'Orange', 'price':1200})
table.insert({'name':'Mango', 'price':840})

print(table.all())

Item = Query()
res = table.search(Item.name == 'Orange')
print('Orange is', res[0]['price'])

print("800円以上のもの:")
res = table.search(Item.price >= 800)
for it in res:
	print("-", it['name'])

うーん、　jsonですね。phpからmongodbのinsert, fetchよりもコード量が少ないので、書きやすいかもしれませんね。
[vagrant@localhost python]$ python3 app.py
[{‘name’: ‘Banana’, ‘price’: 600}, {‘name’: ‘Orange’, ‘price’: 1200}, {‘name’: ‘Mango’, ‘price’: 840}]
Orange is 1200
800円以上のもの:
– Orange
– Mango