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AppInventor2 解析json数据技巧 - App应用开发 - 清泛IT社区，为创新赋能！
...代码要求：解析出每一项的 value 数值。
技巧： [] 的是列表，{} 是字典，用不同的解析方法，查找元素的方法也不一样。
拿出指定对象的值
遍历所有对象列表：
Mail multipart/alternative vs multipart/mixed
...to the file to be attached.
Returns:
An object containing a base64url encoded email object.
"""
message = MIMEMultipart('mixed')
message['to'] = to
message['from'] = sender
message['subject'] = subject
message_alternative = MIMEMultipart('alternative')
message...
How to detect the current OS from Gradle
...Arch"
}
Just be aware that getArch() will return:
"ppc" on PowerPC
"amd64" on 64b
"i386" OR "x86" on 32b.
getArch() will return "x86" on Solaris or "i386" for any other platform.
Edit 2:
Or if you want to avoid any import, you can simply do it yourself:
def getOsName(project) {
final St...
How does RegexOptions.Compiled work?
...| x86 | 4 ms | 26 ms | 31 ms
Interpreted | x64 | 5 ms | 29 ms | 35 ms
Compiled | x86 | 913 ms | 3775 ms | 4487 ms
Compiled | x64 | 3300 ms | 21985 ms | 22793 ms
1,000,000 matches - re...
Download file from web in Python 3
...access to the file.
import urllib.request
import gzip
...
# Read the first 64 bytes of the file inside the .gz archive located at `url`
url = 'http://example.com/something.gz'
with urllib.request.urlopen(url) as response:
with gzip.GzipFile(fileobj=response) as uncompressed:
file_header ...
After Installing Java JDK 7 For Mac OS X - mvn -version still shows java version 1.6.0_31
...
Mahmoud AdamMahmoud Adam
5,26455 gold badges3333 silver badges5959 bronze badges
...
How to completely remove node.js from Windows
...X and Linux, but couldn't find anything for Windows. I'm running Windows 7 64-bit.
8 Answers
...
What's the difference between `1L` and `1`?
...ypeof(y) # double, twice the memory size
object.size(y) # 840 bytes (on win64)
z <- x+1L
typeof(z) # still integer
object.size(z) # 440 bytes (on win64)
...but also note that working excessively with integers can be dangerous:
1e9L * 2L # Works fine; fast lean and mean!
1e9L * 4L # Ooops, o...
How to avoid overflow in expr. A * B - C * D
...
Both long long and double are 64 bits. Since double has to allocate some bits for the exponent, it has a smaller range of possible values without loss of precision.
– Jim Garrison
Nov 5 '12 at 19:03
...