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Writing a pandas DataFrame to CSV file
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I would add index=False to drop the index.
– Medhat
Jul 3 '19 at 20:48
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Bring element to front using CSS
...out how to bring images to front using CSS . I've already tried setting z-index to 1000 and position to relative, but it still fails.
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Pandas every nth row
...use to get the nth data or drop the nth row is the following:
df1 = df[df.index % 3 != 0] # Excludes every 3rd row starting from 0
df2 = df[df.index % 3 == 0] # Selects every 3rd raw starting from 0
This arithmetic based sampling has the ability to enable even more complex row-selections.
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SQL keys, MUL vs PRI vs UNI
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It means that the field is (part of) a non-unique index. You can issue
show create table <table>;
To see more information about the table structure.
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How do HashTables deal with collisions?
...collision. I will explain some of them
Chaining:
In chaining we use array indexes to store the values. If hash code of second value also points to the same index then we replace that index value with an linked list and all values pointing to that index are stored in the linked list and actual array...
Right way to reverse pandas.DataFrame?
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data.reindex(index=data.index[::-1])
or simply:
data.iloc[::-1]
will reverse your data frame, if you want to have a for loop which goes from down to up you may do:
for idx in reversed(data.index):
print(idx, data.loc[idx, ...
MongoDB: Is it possible to make a case-insensitive query?
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Note that this will do a fullscan instead of using index.
– Martin Konicek
Apr 25 '13 at 13:29
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Get the index of the nth occurrence of a string?
...s - you won't actually be checking any case twice, if you think about it. (IndexOf will return as soon as it finds the match, and you'll keep going from where it left off.)
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Nginx serves .php files as downloads, instead of executing them
...rking but... If I go to the main http://5.101.99.123 it's downloading my index.php :/
26 Answers
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Why does PostgreSQL perform sequential scan on indexed column?
Very simple example - one table, one index, one query:
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