4 examples of 'how to initialize a dictionary in python' in Python

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def __init__(self):
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    self.word2idx = {} # word: index
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    self.idx2word = [] # position(index): word

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def _initialize_dicts():
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	"""
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	Create the colorspace encoding and decoding dictionaries.
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	"""
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	enc = {}
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	for i, c1 in enumerate("ACGT"):
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		enc['N' + c1] = '4'
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		enc[c1 + 'N'] = '4'
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		enc['.' + c1] = '4'
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		enc[c1 + '.'] = '4'
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		for j, c2 in enumerate("ACGT"):
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			# XOR of nucleotides gives color
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			enc[c1 + c2] = chr(ord('0') + (i ^ j))
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	enc.update({ 'NN': '4', 'N.': '4', '.N': '4', '..': '4'})
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	dec = {}
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	for i, c1 in enumerate("ACGT"):
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		dec['.' + str(i)] = 'N'
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		dec['N' + str(i)] = 'N'
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		dec[c1 + '4'] = 'N'
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		dec[c1 + '.'] = 'N'
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		for j, c2 in enumerate("ACGT"):
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			# XOR of nucleotides gives color
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			dec[c1 + chr(ord('0') + (i ^ j))] = c2
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	dec['N4'] = 'N'
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	return (enc, dec)

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def __init__(self):
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    self.word2idx = {}
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    self.idx2word = []

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def __init__(self):
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    self._first_key = None
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    self._first_value = None
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    self._second_key = None
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    self._second_value = None
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    self._third_key = None
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    self._third_value = None
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    self._use_properties = True
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    self._use_dict = False
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    self._dict = None