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How to iterate over rows in a DataFrame in Pandas
...data
result = [f(x) for x in df['col']]
# Iterating over two columns, use `zip`
result = [f(x, y) for x, y in zip(df['col1'], df['col2'])]
# Iterating over multiple columns - same data type
result = [f(row[0], ..., row[n]) for row in df[['col1', ...,'coln']].to_numpy()]
# Iterating over multiple col...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...建议我检查一下是不是索引不佳所致，死马当活马医，我激活了Profiler记录慢操作：
mongo> use <DB>
mongo> db.setProfilingLevel(1);
不过结果显示基本都是insert操作（因为我是导入数据为主），本身就不需要索引：
mongo> use <DB>
mongo> ...
界面布局组件 · App Inventor 2 中文网
...路 在线 客服 扫码添加客服咨询 我要 分享 扫码分享到朋友圈 顶部 var qrcode = new QRCode("qrcode", { text: window.location.href + "?f=share", //...
Download File to server from URL
...assing a stream-handle as the $data parameter:
file_put_contents("Tmpfile.zip", fopen("http://someurl/file.zip", 'r'));
From the manual:
If data [that is the second argument] is a stream resource, the remaining buffer of that stream will be copied to the specified file. This is similar with u...
How to re-sign the ipa file?
...
CERTIFICATE="Name of certificate: To sign with" # must be in keychain
# unzip the ipa
unzip -q "$IPA"
# remove the signature
rm -rf Payload/*.app/_CodeSignature
# replace the provision
cp "$PROVISION" Payload/*.app/embedded.mobileprovision
# sign with the new certificate (--resource-rules has been ...
How can I see the size of a GitHub repository before cloning it?
...d then check the in the same place.
Somewhat hacky: use the download as a zip file option, read the file size indicated and then cancel it.
I do not remember if downloading as a zip ever worked, but in any case, doing so now only downloads the currently selected branch with no history.
...
Shuffle two list at once with same order
... can do it as:
import random
a = ['a', 'b', 'c']
b = [1, 2, 3]
c = list(zip(a, b))
random.shuffle(c)
a, b = zip(*c)
print a
print b
[OUTPUT]
['a', 'c', 'b']
[1, 3, 2]
Of course, this was an example with simpler lists, but the adaptation will be the same for your case.
Hope it helps. Good L...
StatusbarTools 扩展 - 状态栏自定义工具 · App Inventor 2 中文网
...源
许可证: 开源许可证
注意: 此扩展不再更新，源代码已公开供开发者参考和修改。
相关资源
MIT App Inventor官方文档
扩展开发指南
其他状态栏扩展
本文档基于StatusbarTools扩展的论坛发布信息整理，...
How do you extract a column from a multi-dimensional array?
...
check it out!
a = [[1, 2], [2, 3], [3, 4]]
a2 = zip(*a)
a2[0]
it is the same thing as above except somehow it is neater
the zip does the work but requires single arrays as arguments, the *a syntax unpacks the multidimensional array into single array arguments
...
Extract filename and extension in Bash
...the file type. Consider if you had a game called dinosaurs.in.tar and you gzipped it to dinosaurs.in.tar.gz :)
– porges
Jun 13 '09 at 9:11
11
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