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解决Scrapy警告:You do not have a working installation of the service_i...
...要安装一个模块service_identity，根据提示地址（https: pypi python org pypi service_identity）来安装 使用scrapy进行爬虫项目的操作时，出现如下错误：
从提示错误来看，我们需要安装一个模块service_identity，根据提示地址（https://pypi.py...
解决Scrapy警告:You do not have a working installation of the service_i...
...要安装一个模块service_identity，根据提示地址（https: pypi python org pypi service_identity）来安装 使用scrapy进行爬虫项目的操作时，出现如下错误：
从提示错误来看，我们需要安装一个模块service_identity，根据提示地址（https://pypi.py...
解决Scrapy警告:You do not have a working installation of the service_i...
...要安装一个模块service_identity，根据提示地址（https: pypi python org pypi service_identity）来安装 使用scrapy进行爬虫项目的操作时，出现如下错误：
从提示错误来看，我们需要安装一个模块service_identity，根据提示地址（https://pypi.py...
enum - getting value of enum on string conversion
...
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Shared-memory objects in multiprocessing
...es (even over a network).
The Manager approach can be used with arbitrary Python objects, but will be slower than the equivalent using shared memory because the objects need to be serialized/deserialized and sent between processes.
There are a wealth of parallel processing libraries and approaches...
SQLAlchemy IN clause
...rnative way is using raw SQL mode with SQLAlchemy, I use SQLAlchemy 0.9.8, python 2.7, MySQL 5.X, and MySQL-Python as connector, in this case, a tuple is needed. My code listed below:
id_list = [1, 2, 3, 4, 5] # in most case we have an integer list or set
s = text('SELECT id, content FROM myTable W...
How to prevent errno 32 broken pipe?
Currently I am using an app built in python. When I run it in personal computer, it works without problems.
4 Answers
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An efficient way to transpose a file in Bash
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A Python solution:
python -c "import sys; print('\n'.join(' '.join(c) for c in zip(*(l.split() for l in sys.stdin.readlines() if l.strip()))))" < input > output
The above is based on the following:
import sys
for c i...
How do I perform the SQL Join equivalent in MongoDB?
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$unwind - because data is denormalised correctly, else wrapped in arrays
Python code..
db.LeftTable.aggregate([
# connect all tables
{"$lookup": {
"from": "RightTable",
"localField": "ID",
...
How can I access Google Sheet spreadsheets only with Javascript?
...recipes" (JSON payloads) for core API requests
If you're not "allergic" to Python (if you are, just pretend it's pseudocode ;) ), I made several videos with more "real-world" samples of using the API you can learn from and migrate to JS if desired (NOTE: even though it's Python code, most API reques...