• Connect 4 Python Program
• Connect 4 Python Easy
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Import rethinkdb as r r.connect(options) → connection Create a new connection to the database server. The keyword arguments are:. host: host of the RethinkDB instance. The default value is localhost. port: the driver port, by default 28015.

db: the database used if not explicitly specified in a query, by default test. user: the user account to connect as (default admin). password: the password for the user account to connect as (default ', empty). timeout: timeout period in seconds for the connection to be opened (default 20).

ssl: a hash of options to support SSL connections (default None). Currently, there is only one option available, and if the ssl option is specified, this key is required:. cacerts: a path to the SSL CA certificate.

If the connection cannot be established, a ReqlDriverError exception will be thrown. Example: Open a connection using the default host and port, specifying the default database. For doc in r.

Table ( 'marvel' ). Run ( conn ): print doc stream.changes(options) → stream singleSelection.changes(options) → stream Turn a query into a changefeed, an infinite stream of objects representing changes to the query’s results as they occur. A changefeed may return changes to a table or an individual document (a “point” changefeed). Commands such as filter or map may be used before the changes command to transform or filter the output, and many commands that operate on sequences can be chained after changes. Example: Subscribe to the changes on a table.

Start monitoring the changefeed in one client. Setlooptype ( 'tornado' ) conn = r. Connect ( host = 'localhost', port = 28015 ) @gen.coroutine def usecursor ( conn ): # Print every row in the table. Cursor = yield r. Table ( 'test' ).

Orderby ( index = 'id' ). Run ( yield conn ) while ( yield cursor. Fetchnext ): item = yield cursor. Next print ( item ) For a longer discussion with both Tornado and Twisted examples, see the documentation article on. Cursors cursor.next(wait=True) Get the next element in the cursor. Example: Retrieve the next element.

Table ( 'comments' ). Get ( '7eab9e63-73f1-4f33-8ce4-95cbea626f59' ). Run ( conn ) table.sync → object sync ensures that writes on a given table are written to permanent storage. Queries that specify soft durability ( durability='soft') do not give such guarantees, so sync can be used to ensure the state of these queries. A call to sync does not return until all previous writes to the table are persisted.

Example: After having updated multiple heroes with soft durability, we now want to wait until these changes are persisted. Table ( 'marvel' ).

Getall ( 'manofsteel', index = 'codename' ). Run ( conn ) table.between(lowerkey, upperkey, options) → tableslice tableslice.between(lowerkey, upperkey, options) → tableslice Get all documents between two keys. Accepts three optional arguments: index, leftbound, and rightbound. If index is set to the name of a secondary index, between will return all documents where that index’s value is in the specified range (it uses the primary key by default). Leftbound or rightbound may be set to open or closed to indicate whether or not to include that endpoint of the range (by default, leftbound is closed and rightbound is open).

Example: Find all users with primary key = 10 and. Table ( 'marvel' ). Between ( 10, 20 ).

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Run ( conn ) selection.filter(predicatefunction, default=False) → selection stream.filter(predicatefunction, default=False) → stream array.filter(predicatefunction, default=False) → array Return all the elements in a sequence for which the given predicate is true. The return value of filter will be the same as the input (sequence, stream, or array). Documents can be filtered in a variety of ways—ranges, nested values, boolean conditions, and the results of anonymous functions. Example: Get all users who are 30 years old. Table ( 'marvel' ). Innerjoin ( r.

Table ( 'dc' ), lambda marvelrow, dcrow: marvelrow 'strength'. Table ( 'marvel' ). Outerjoin ( r.

Table ( 'dc' ), lambda marvelrow, dcrow: marvelrow 'strength'. Table ( 'marvel' ). Eqjoin ( 'maindccollaborator', r. Table ( 'dc' )).

Run ( conn ) Transformations sequence1.map(sequence2., function) → stream array1.map(array2., function) → array r.map(sequence1, sequence2., function) → stream r.map(array1, array2., function) → array Transform each element of one or more sequences by applying a mapping function to them. If map is run with two or more sequences, it will iterate for as many items as there are in the shortest sequence. Example: Return the first five squares. Expr ( 1, 2, 3, 4, 5 ).

Map ( lambda val: ( val. val )). Run ( conn ) 1, 4, 9, 16, 25 sequence.withfields(selector1, selector2.) → stream array.withfields(selector1, selector2.) → array Plucks one or more attributes from a sequence of objects, filtering out any objects in the sequence that do not have the specified fields. Functionally, this is identical to followed by on a sequence.

Example: Get a list of users and their posts, excluding any users who have not made any posts. Existing table structure. Table ( 'marvel' ). Orderby ( 'belovedness' ). Limit ( 10 ).

Run ( conn ) selection.slice(startoffset, endoffset, leftbound='closed', rightbound='open') → selection stream.slice(startoffset, endoffset, leftbound='closed', rightbound='open') → stream array.slice(startoffset, endoffset, leftbound='closed', rightbound='open') → array binary.slice(startoffset, endoffset, leftbound='closed', rightbound='open') → binary string.slice(startoffset, endoffset, leftbound='closed', rightbound='open') → string Return the elements of a sequence within the specified range. Example: Return the fourth, fifth and sixth youngest players. (The youngest player is at index 0, so those are elements 3–5.). Table ( 'words' ). Orderby ( 'id' ).

Fold ( ', lambda acc, word: acc + r. Branch ( acc ', ', ', ' ) + word ). Run ( conn ) (This example could be implemented with reduce, but fold will preserve the order when words is a RethinkDB table or other stream, which is not guaranteed with reduce.) sequence.count(value predicatefunction) → number binary.count → number string.count → number object.count → number r.count(sequence binary string object, predicatefunction) → number Counts the number of elements in a sequence or key/value pairs in an object, or returns the size of a string or binary object.

Example: Count the number of users. Table ( 'users' ).

Run ( conn ) sequence.sum(field function) → number r.sum(sequence, field function) → number Sums all the elements of a sequence. If called with a field name, sums all the values of that field in the sequence, skipping elements of the sequence that lack that field. If called with a function, calls that function on every element of the sequence and sums the results, skipping elements of the sequence where that function returns None or a non-existence error.

Example: What’s 3 + 5 + 7? Expr ( 3, 5, 7 ). Run ( conn ) sequence.avg(field function) → number r.avg(sequence, field function) → number Averages all the elements of a sequence.

If called with a field name, averages all the values of that field in the sequence, skipping elements of the sequence that lack that field. If called with a function, calls that function on every element of the sequence and averages the results, skipping elements of the sequence where that function returns None or a non-existence error. Example: What’s the average of 3, 5, and 7?

Table ( 'marvel' ). Concatmap ( lambda hero: hero 'villainlist' ). Run ( conn ) sequence.contains(value predicatefunction.) → bool r.contains(sequence, value predicatefunction.) → bool When called with values, returns True if a sequence contains all the specified values. When called with predicate functions, returns True if for each predicate there exists at least one element of the stream where that predicate returns True.

Example: Has Iron Man ever fought Superman? Table ( 'marvel' ). Get ( 'IronMan' ). Pluck ( 'reactorState', 'reactorPower' ).

Run ( conn ) sequence.without(selector1, selector2.) → stream array.without(selector1, selector2.) → array singleSelection.without(selector1, selector2.) → object object.without(selector1, selector2.) → object The opposite of pluck; takes an object or a sequence of objects, and returns them with the specified paths removed. Example: Since we don’t need it for this computation we’ll save bandwidth and leave out the list of IronMan’s romantic conquests.

Table ( 'marvel' ). Get ( 'IronMan' ).

Without ( 'personalVictoriesList' ). Run ( conn ) singleSelection.merge(object function, object function.) → object object.merge(object function, object function.) → object sequence.merge(object function, object function.) → stream array.merge(object function, object function.) → array Merge two or more objects together to construct a new object with properties from all. When there is a conflict between field names, preference is given to fields in the rightmost object in the argument list merge also accepts a subquery function that returns an object, which will be used similarly to a function.

Example: Equip Thor for battle. Table ( 'users' ). Filter ( lambda doc: doc 'name'. Match ( '^A' ) ).

Run ( conn ) string.split(separator, maxsplits) → array Splits a string into substrings. Splits on whitespace when called with no arguments. When called with a separator, splits on that separator. When called with a separator and a maximum number of splits, splits on that separator at most maxsplits times.

(Can be called with None as the separator if you want to split on whitespace while still specifying maxsplits.) Example: Split on whitespace. Not ( True ). Run ( conn ) r.

Expr ( True ). Run ( conn ) ( r.

Expr ( True )). Run ( conn ) These evaluate to false.

Note that when using the expression is wrapped in parentheses. Without this, Python will evaluate r.expr(True) first rather than using the ReQL operator and return an incorrect value. ( True evaluates to −2 in Python.) r.random → number r.random(number, number, float=True) → number r.random(integer, integer) → integer Generate a random number between given (or implied) bounds. Random takes zero, one or two arguments. Example: Generate a random number in the range 0,1). Table ( 'players' ). Get ( '86be93eb-a112-48f5-a829-15b2cb49de1d' ).

Do ( lambda player: player 'grossscore' - player 'coursehandicap' ). Run ( conn ) r.branch(test, trueaction, test2, test2action., falseaction) → any test.branch(trueaction, test2, test2action., falseaction) → any Perform a branching conditional equivalent to if-then-else. The branch command takes 2n+1 arguments: pairs of conditional expressions and commands to be executed if the conditionals return any value but False or None (i.e., “truthy” values), with a final “else” command to be evaluated if all of the conditionals are False or None. Example: Test the value of x. Table ( 'marvel' ).

Get ( 'IronMan' ). Do ( lambda ironman: r. Branch ( ironman 'victories'. Run ( conn ) '27961a0e-f4e8-4eb3-bf95-c5203e1d87b9' Geospatial commands r.circle(longitude, latitude, radius, numvertices=32, geosystem='WGS84', unit='m', fill=True) → geometry r.circle(point, radius, numvertices=32, geosystem='WGS84', unit='m', fill=True) → geometry Construct a circular line or polygon. A circle in RethinkDB is a polygon or line approximating a circle of a given radius around a given center, consisting of a specified number of vertices (default 32). Example: Define a circle. Secretbase = r.

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Point ( - 122.422876, 37.777128 ) r. Table ( 'hideouts' ). Getnearest ( secretbase, index = 'location', maxresults = 25 ). Run ( conn ) sequence.includes(geometry) → sequence geometry.includes(geometry) → bool Tests whether a geometry object is completely contained within another. When applied to a sequence of geometry objects, includes acts as a, returning a sequence of objects from the sequence that include the argument. Example: Is point2 included within a 2000-meter circle around point1? point1 = r.

Point ( - 117.220406, 32.719464 ) point2 = r. Point ( - 117.206201, 32.725186 ) r.

Circle ( point1, 2000 ). Includes ( point2 ).

Run ( conn ) True sequence.intersects(geometry) → sequence geometry.intersects(geometry) → bool r.intersects(sequence, geometry) → sequence r.intersects(geometry, geometry) → bool Tests whether two geometry objects intersect with one another. When applied to a sequence of geometry objects, intersects acts as a, returning a sequence of objects from the sequence that intersect with the argument. Example: Is point2 within a 2000-meter circle around point1? point1 = r. Point ( - 117.220406, 32.719464 ) point2 = r. Point ( - 117.206201, 32.725186 ) r. Circle ( point1, 2000 ).

Intersects ( point2 ). Run ( conn ) True r.line(lon1, lat1, lon2, lat2.) → line r.line(point1, point2.) → line Construct a geometry object of type Line. The line can be specified in one of two ways:. Two or more two-item arrays, specifying latitude and longitude numbers of the line’s vertices;.

Two or more objects specifying the line’s vertices. Example: Define a line. Table ( 'superheroes' ). Run ( conn ) table.wait(waitfor='allreplicasready', timeout=) → object database.wait(waitfor='allreplicasready', timeout=) → object r.wait(table database, waitfor='allreplicasready', timeout=) → object Wait for a table or all the tables in a database to be ready.

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A table may be temporarily unavailable after creation, rebalancing or reconfiguring. The wait command blocks until the given table (or database) is fully up to date. Example: Wait on a table to be ready.