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Writing a Python list of lists to a csv file
...',2]]
In [3]: my_df = pd.DataFrame(a)
In [4]: my_df.to_csv('my_csv.csv', index=False, header=False)
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Getting the last element of a list
...lement
>>> some_list
[1, 3, 5]
Note that getting a list item by index will raise an IndexError if the expected item doesn't exist. This means that some_list[-1] will raise an exception if some_list is empty, because an empty list can't have a last element.
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How to pass variable from jade template file to a script file?
... having trouble with a variable (config) declared in a jade template file (index.jade) that isn't passed to a javascript file, which then makes my javascript crash. Here is the file (views/index.jade):
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Number of occurrences of a character in a string [duplicate]
...u could do this:
int count = test.Split('&').Length - 1;
Or with LINQ:
test.Count(x => x == '&');
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Large, persistent DataFrame in pandas
...der, which is iterable with chunks of 1000 rows.
df = pd.concat(tp, ignore_index=True) # df is DataFrame. If errors, do `list(tp)` instead of `tp`
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Different ways of adding to Dictionary
...can check this out by opening the class in Reflector.net
This is the This indexer:
public TValue this[TKey key]
{
get
{
int index = this.FindEntry(key);
if (index >= 0)
{
return this.entries[index].value;
}
ThrowHelper.ThrowKeyNotFound...
Git commit in terminal opens VIM, but can't get back to terminal
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To save your work and exit press Esc and then :wq (w for write and q for quit).
Alternatively, you could both save and exit by pressing Esc and then :x
To set another editor run export EDITOR=myFavoriteEdioron your terminal, where myFavoriteEdior can be vi, gedit, subl(f...
How to determine the longest increasing subsequence using dynamic programming?
...f the LIS (Longest increasing subsequence) which is ending at element with index i. To compute DP[i] we look at all indices j < i and check both if DP[j] + 1 > DP[i] and array[j] < array[i] (we want it to be increasing). If this is true we can update the current optimum for DP[i]. To find t...
How to implement a many-to-many relationship in PostgreSQL?
...on CREATE TABLE in the manual.
Primary keys are implemented with a unique index on the key columns, that makes queries with conditions on the PK column(s) fast. However, the sequence of key columns is relevant in multicolumn keys. Since the PK on bill_product is on (bill_id, product_id) in my examp...
undefined method `source_index' for Gem:Module (NoMethodError)
...n 2.0.2 for me, and 1.9.3-p327 has RubyGems v1.8.23 installed.
Gem.source_index has been deprecated for a while, but since Rails 2.3 is not getting any updates except critical security patches, this will never get fixed. RubyGems v2.0 finally removed that method. Downgrade to any rubygems version p...