moduleは、.pyファイル
packageは、ディレクトリ。_path_をもつ。
---
matplotlibの例で、pyplot.pyの入っているディレクトリは
.../matplotlib/pyplot.py となっている。
import matplotlib.pyplot as plt
と
from matplotlib import pyplot as plt
は、どちらの書き方でも同じimportができる。
---
foo.py というファイルに
def bar():
pass
という関数があったとする。
があったとする。このときは、
from foo import bar # これはOK。関数barがimportできる。
import foo.bar # これはNG
という違いがある。
/foo/bar.py
という構造になっていればどちらでもOK。
参考
https://stackoverflow.com/questions/51615051/how-can-i-remove-vue-cli-2
$ vue --version
2.9.6
からスタート。cliを入れたいので
$ sudo npm uninstall -g vue-cli
$ sudo npm install -g @vue/cli
をやってみるが
ERR! code EACCES
npm ERR! syscall access
npm ERR! path /usr/local/lib/node_modules/vue-cli/node_modules/absolute
npm ERR! errno -13
npm ERR! Error: EACCES: permission denied, access '/usr/local/lib/node_modules/vue-cli/node_modules/absolute'
npm ERR! [Error: EACCES: permission denied, access '/usr/local/lib/node_modules/vue-cli/node_modules/absolute'] {
npm ERR! errno: -13,
npm ERR! code: 'EACCES',
npm ERR! syscall: 'access',
npm ERR! path: '/usr/local/lib/node_modules/vue-cli/node_modules/absolute'
npm ERR! The operation was rejected by your operating system.$ which vue
/usr/local/bin/vue
$ cd /usr/local/bin/
:/usr/local/bin$ ll *vue*
lrwxrwxrwx 1 root root 35 8月 12 06:22 vue -> ../lib/node_modules/vue-cli/bin/vue*
lrwxrwxrwx 1 root root 40 8月 12 06:22 vue-init -> ../lib/node_modules/vue-cli/bin/vue-init*
lrwxrwxrwx 1 root root 40 8月 12 06:22 vue-list -> ../lib/node_modules/vue-cli/bin/vue-list*ということで、vue, vue-ini, vuie-listを消した。
nでnodeをアップデートしてから、vue/cliを再インストールするとどうにかできました。
$ sudo npm install -g n
$ sudo n stable
$ node --version
v14.15.4
$ sudo npm install -g @vue/cli
+ @vue/cli@4.5.11
added 1391 packages from 707 contributors in 104.949s
$ vue --version
@vue/cli 4.5.11Arduinoでシリアル出力して、Linuxで受信して表示します。
こちらのブログのコードを少しだけ変えました。元ブログはPart1から4まであります。
https://chrisheydrick.com/2012/06/12/how-to-read-serial-data-from-an-arduino-in-linux-with-c-part-1/
シンプルなHelloWorldです。書き込んでシリアル出力を確認。
void setup()
{
Serial.begin(9600);
}
void loop()
{
Serial.print("Hello World\n");
delay(1000);
}
Linux側$ gcc -Wall -o serial read_serial.c$ ./serial
#include <stdio.h>
#include <stdlib.h>
#include <x86_64-linux-gnu/sys/ioctl.h>
#include <fcntl.h>
#include <termios.h>
/* My Arduino is on /dev/ttyACM0 */
char *portname = "/dev/ttyACM0";
char buf[256];
int main(int argc, char *argv[])
{
int fd;
/* Open the file descriptor in non-blocking mode */
fd = open(portname, O_RDWR | O_NOCTTY);
/* Set up the control structure */
struct termios toptions;
/* Get currently set options for the tty */
tcgetattr(fd, &toptions);
/* Set custom options */
/* 9600 baud */
cfsetispeed(&toptions, B9600);
cfsetospeed(&toptions, B9600);
/* 8 bits, no parity, no stop bits */
toptions.c_cflag &= ~PARENB;
toptions.c_cflag &= ~CSTOPB;
toptions.c_cflag &= ~CSIZE;
toptions.c_cflag |= CS8;
/* no hardware flow control */
toptions.c_cflag &= ~CRTSCTS;
/* enable receiver, ignore status lines */
toptions.c_cflag |= CREAD | CLOCAL;
/* disable input/output flow control, disable restart chars */
toptions.c_iflag &= ~(IXON | IXOFF | IXANY);
/* disable canonical input, disable echo,
disable visually erase chars,
disable terminal-generated signals */
toptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
/* disable output processing */
toptions.c_oflag &= ~OPOST;
/* wait for 12 characters to come in before read returns */
/* WARNING! THIS CAUSES THE read() TO BLOCK UNTIL ALL */
/* CHARACTERS HAVE COME IN! */
toptions.c_cc[VMIN] = 12;
/* no minimum time to wait before read returns */
toptions.c_cc[VTIME] = 0;
/* commit the options */
tcsetattr(fd, TCSANOW, &toptions);
/* Wait for the Arduino to reset */
usleep(1000*1000);
/* Flush anything already in the serial buffer */
tcflush(fd, TCIFLUSH);
/* read up to 128 bytes from the fd */
int n = read(fd, buf, 128);
/* print how many bytes read */
printf("%i bytes got read...\n", n);
/* print what's in the buffer */
printf("Buffer contains...\n%s\n", buf);
return 0;
}
./serial12 bytes got read...Buffer contains...Hello World
qwiklabasでAWSのハンズオンをやっていたら、フリーズして終了していました。そのときはまぁいいかと思って後でまたやろうとすると、ログインできません。
Your account has been blocked. If you believe this could be a mistake, please contact your administrator.
と出ていました。
このエラーが出るのは、許可されていない操作をしてしまったことが原因みたいです。
https://support.google.com/qwiklabs/answer/9157984?hl=en
上記にあるコンタクトフォーム(https://support.google.com/qwiklabs/contact/contact_us)からメールを送ってみました。
・Hello,
・My account<hoge@... > がブロックされたみたいです
・最後にやっていたLABはXXXです
・確認してもらえますか
・Thanks in advance.
的なことを書きました。英語で書きましたが、受け付け確認メールには日本語でも良いということが書いてありました。
Psst... at Qwiklabs, we also speak Japanese, Spanish, Brazilian Portuguese, and German! :)
土曜日の21時くらいにサポートフォームから送りましたが、2分後に連絡があって解除してもらえました。速い。
メッセージは、
... your account was blocked due to the reason "resource_limit_exceeded".
This happens when one tries to launch the resources which are not configured in the lab environment. Thus the system automatically blocks those user accounts.
To avoid such case in the future, please make sure that you are not launching the resources which are not configured in the lab environment. As an exception, we have unblocked your account and you can access your account now.
・・・ということで、labのハンズオンに関係ないリソースを触ろうとしたのでブロックになっていたようです。今回は特別に解除してあげます、とのこと。
ハンズオンの設定ってどうなっているのか、と思って探したのが問題だったみたいですね。反省。以後気をつけたいと思います。
最初の部分だけを以前やったときのメモ。2017年くらいなので古いかもしれない。
http://programmingcomputervision.com/
にオライリー本の最終ドラフトpdfがおいてある。
コードはgithubにある。
PILはPytnon2.7で開発が止まっているのでforkされたpillowを使う。
pillowをcondaで入れるとバグる。pipで入れ直すとよい。
https://github.com/python-pillow/Pillow/issues/2945
インポートはこんな感じ
from PIL import Image
from pylab import *
画像をくり抜いたり、反転させたり、コーナーを検出したりしている
--
他にも沢山ブログなどで紹介されている
http://datahacker.rs/opencv-harris-corner-detector-part2/
https://docs.aws.amazon.com/ja_jp/glue/latest/dg/how-it-works.html
S3、Redshift、ES、splunkしなかい。入力はいろいろ(省略)
出力のS3の意味: AthenaでクエリがS3に保存されるので簡易的なETLとして利用できる。
- ファイル(.csv .tsv. dlf. elf. xlsx .json) エクセルxlsxも対応。zip または gzipでの暗号化ファイルはそのまま使える
- QuickSightのソースにESも使えるようになった(2020年11月のアップデート)
https://docs.aws.amazon.com/ja_jp/quicksight/latest/user/supported-data-sources.html
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S3で標準 IA(Infrequently access)という低頻度アクセスでコスト削減ができるクラスがあります。
オハイオの1GBで計算してみると
1GB/月 ストレージ 0.023 USD
1000リクエスト 0.005 USD
取り出し無料
1GB/月 ストレージ 0.0125 USD
1000リクエスト 0.01 USD
1GB取り出し料金 0.01 USD
取り出し料金はけっこう高い。1回で月間のストレージ料金の80%に相当。
1GBを月に1回でも取り出すなら、標準S3にしておいたほうが良さそう。
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Redshift SpectrumやAthenaからS3-IAにアクセスしても特に変わらないようです。
https://forums.aws.amazon.com/thread.jspa?threadID=285948
https://www.mofa.go.jp/mofaj/a_o/c_m1/cn/page4_005086.htmlア 香港の最近の状況に関し，安倍総理から，引き続き「一国二制度」の下，自由で開かれた香港が繁栄していくことの重要性を指摘。イ 安倍総理から，いかなる国であっても，自由、人権の尊重や法の支配といった国際社会の普遍的価値が保障されることの重要性を指摘。
モニター用の細いケーブルで場所を取らなくなってすっきり。