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@@ -74,8 +74,9 @@ The repr method in Python takes a single object parameter and returns a printabl
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# write content to files using repr
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# write content to files using repr
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with open('/tmp/file.py') as f:f.write(repr(a))
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with open('/tmp/file.py') as f:f.write(repr(a))
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ast.literal_eval
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ast.literal_eval
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________________
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----------------
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The literal_eval method safely parses and evaluates an expression for a Python datatype.
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The literal_eval method safely parses and evaluates an expression for a Python datatype.
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Supported data types are: strings, numbers, tuples, lists, dicts, booleans and None.
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Supported data types are: strings, numbers, tuples, lists, dicts, booleans and None.
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@@ -95,6 +96,7 @@ Simple example for reading:
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.. code-block:: python
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.. code-block:: python
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# Reading CSV content from a file
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import csv
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import csv
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with open('/tmp/file.csv', newline='') as f:
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with open('/tmp/file.csv', newline='') as f:
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reader = csv.reader(f)
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reader = csv.reader(f)
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@@ -105,6 +107,7 @@ Simple example for writing:
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.. code-block:: python
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.. code-block:: python
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# Writing CSV content to a file
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import csv
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import csv
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with open('/temp/file.csv', 'w', newline='') as f:
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with open('/temp/file.csv', 'w', newline='') as f:
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writer = csv.writer(f)
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writer = csv.writer(f)
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@@ -123,6 +126,7 @@ structures in Python. One such example is below.
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.. code-block:: python
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.. code-block:: python
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# Reading YAML content from a file using the load method
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import yaml
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import yaml
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with open('/tmp/file.yaml', 'r', newline='') as f:
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with open('/tmp/file.yaml', 'r', newline='') as f:
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try:
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try:
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@@ -144,22 +148,66 @@ Reading:
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.. code-block:: python
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.. code-block:: python
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# Reading JSON content from a file
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import json
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import json
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with open('/tmp/file.json', 'r') as f:
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with open('/tmp/file.json', 'r') as f:
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data = json.dump(f)
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data = json.load(f)
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Writing:
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Writing:
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.. code-block:: python
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.. code-block:: python
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# writing JSON content to a file using the dump method
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import json
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import json
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with open('/tmp/file.json', 'w') as f:
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with open('/tmp/file.json', 'w') as f:
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json.dump(data, f, sort_keys=True)
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json.dump(data, f, sort_keys=True)
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=================
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XML (nested data)
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=================
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******
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XML parsing in Python is possible using the `xml` package.
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Pickle
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******
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Example:
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.. code-block:: python
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# reading XML content from a file
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import xml.etree.ElementTree as ET
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tree = ET.parse('country_data.xml')
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root = tree.getroot()
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More documentation on using the `xml.dom` and `xml.sax` packages can be found
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`here <https://docs.python.org/3/library/xml.html>`__.
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*******
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Binary
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*******
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=======================
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Numpy Array (flat data)
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=======================
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Python's Numpy array can be used to serialize and deserialize data to and from byte representation.
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Example:
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.. code-block:: python
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import numpy as np
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# Converting Numpy array to byte format
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byte_output = np.array([ [1, 2, 3], [4, 5, 6], [7, 8, 9] ]).tobytes()
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# Converting byte format back to Numpy array
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array_format = np.frombuffer(byte_output)
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====================
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Pickle (nested data)
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====================
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The native data serialization module for Python is called `Pickle
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The native data serialization module for Python is called `Pickle
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<https://docs.python.org/2/library/pickle.html>`_.
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<https://docs.python.org/2/library/pickle.html>`_.
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