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Solve in Python:
One of the services provided by an operating system is memory management. The OS typically provides an API for allocating and releasing memory in a process's address space. A process should only read and write memory at addresses which have been allocated by the operating system. In this kata you will implement a simulation of a simple memory manager.

The language you will be using has no low level memory API, so for our simulation we will simply use an array as the process address space. The memory manager constructor will accept an array (further referred to as `memory`) where blocks of indices will be allocated later.

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# Memory Manager Contract

## allocate(size)

`allocate` reserves a sequential block (sub-array) of `size` received as an argument in `memory`. It should return the index of the first element in the allocated block, or throw an exception if there is no block big enough to satisfy the requirements.

## release(pointer)

`release` accepts an integer representing the start of the block allocated ealier, and frees that block. If the released block is adjacent to a free block, they should be merged into a larger free block. Releasing an unallocated block should cause an exception.

## write(pointer, value)

To support testing this simulation our memory manager needs to support read/write functionality. Only elements within allocated blocks may be written to. The `write` method accepts an index in `memory` and a `value`. The `value` should be stored in `memory` at that index if it lies within an allocated block, or throw an exception otherwise.

## read(pointer)

This method is the counterpart to `write`. Only indices within allocated blocks may be read. The `read` method accepts an index. If the `index` is within an allocated block, the value stored in `memory` at that index should be returned, or an exception should be thrown otherwise.
assistant
#Here is the Python program you requested.

class MemoryManager:
    def __init__(self, memory):
        """
        @constructor Creates a new memory manager for the provided array.
        @param {memory} An array to use as the backing memory.
        """
        self.memory = memory
        self.allocated = {}
        self.free_memory = {0:len(memory)}

    def allocate(self, size):
        """
        Allocates a block of memory of requested size.
        @param {number} size - The size of the block to allocate.
        @returns {number} A pointer which is the index of the first location in the allocated block.
        @raises If it is not possible to allocate a block of the requested size.
        """
        if size > len(self.memory):
            raise 'Cannot allocate more memory than exists'
        for pointer, block_size in list(self.free_memory.items()):
            if block_size >= size:
                self.allocated[pointer] = size
                self.free_memory[pointer+size]= block_size-size
                del self.free_memory[pointer]
                return pointer
        raise 'Cannot allocate more memory than available'
    
    def release(self, pointer):
        """
        Releases a previously allocated block of memory.
        @param {number} pointer - The pointer to the block to release.
        @raises If the pointer does not point to an allocated block.
        """
        self.free_memory[pointer] = self.allocated[pointer]
        del self.allocated[pointer]
        for p, b_size in sorted(self.free_memory.items()):
            if self.free_memory.get(p+b_size):
                self.free_memory[p] += self.free_memory[p+b_size]
                del self.free_memory[p+b_size]

    def read(self, pointer):
        """
        Reads the value at the location identified by pointer
        @param {number} pointer - The location to read.
        @returns {number} The value at that location.
        @raises If pointer is in unallocated memory.
        """
        for p, b_size in list(self.allocated.items()):
            if p <=...