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Getting number of elements in an iterator in Python
Is there an efficient way to know how many elements are in an iterator in Python, in general, without iterating through each and counting?
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Saving an Object (Data persistence)
...pickle module in the standard library.
Here's an elementary application of it to your example:
import pickle
class Company(object):
def __init__(self, name, value):
self.name = name
self.value = value
with open('company_data.pkl', 'wb') as output:
company1 = Company('banan...
Why can't C compilers rearrange struct members to eliminate alignment padding? [duplicate]
Consider the following example on a 32 bit x86 machine:
11 Answers
11
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using lodash .groupBy. how to add your own keys for grouped output?
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You can do it like this in Lodash 4.x
var data = [{
"name": "jim",
"color": "blue",
"age": "22"
}, {
"name": "Sam",
"color": "blue",
"age": "33"
}, {
"name": "eddie",
"color": "green",
"age": "77"
}];
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Chrome sendrequest error: TypeError: Converting circular structure to JSON
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It means that the object you pass in the request (I guess it is pagedoc) has a circular reference, something like:
var a = {};
a.b = a;
JSON.stringify cannot convert structures like this.
N.B.: This would be the case with...
Printing without newline (print 'a',) prints a space, how to remove?
...to work if each of your print statements prints the same string. Note that it works for multiplication of any length string (e.g. 'foo' * 20 works).
>>> print 'a' * 20
aaaaaaaaaaaaaaaaaaaa
If you want to do this in general, build up a string and then print it once. This will consume a bi...
关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...一就是“一切皆文件”，都可以用“打开open –> 读写write/read –> 关闭close”模式来操作。我的理解就是Socket就是该模式的一个实现，socket即是一种特殊的文件，一些socket函数就是对其进行的操作（读/写IO、打开、关闭）
既...
How to parse/read a YAML file into a Python object? [duplicate]
...:
pip install PyYAML
And the Python code looks like this:
import yaml
with open('tree.yaml') as f:
# use safe_load instead load
dataMap = yaml.safe_load(f)
The variable dataMap now contains a dictionary with the tree data. If you print dataMap using PrettyPrint, you will get something ...
What is the preferred/idiomatic way to insert into a map?
...gn a value. Obviously, this can be inefficient if the mapped_type can benefit from being directly initialized instead of default constructed and assigned. This method also makes it impossible to determine if an insertion has indeed taken place or if you have only overwritten the value for an previou...
Multiple glibc libraries on a single host
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It is very possible to have multiple versions of glibc on the same system (we do that every day).
However, you need to know that glibc consists of many pieces (200+ shared libraries) which all must match. One of the pieces i...