Added cookbook

book/_quarto.yml

@@ -15,7 +15,11 @@ book:
     - writing-custom-modules.qmd
     - organizing-python-code.qmd
     - testing.qmd
-
+    - part: Cookbook
+      href: cookbook/index.qmd
+      chapters:
+        - cookbook/dates.qmd
+        - cookbook/tabulate.qmd
     - part: Live Notes
       chapters:
         - live-notes/day1.ipynb

book/cookbook/dates.qmd

@@ -0,0 +1,95 @@
+---
+sidebar: cookbook
+execute:
+  enabled: true
+  cache: true
+---
+
+# Working with Dates
+
+Python has a `datetime` module to work with date, time and datetimes. This recipe focuses only on working with dates.
+
+We start with importing the `datetime` module.
+
+```{python}
+import datetime
+```
+
+For all the examples below, please assume that `datetime` is already imported.
+
+## Common Operations
+
+Creating a date:
+
+```{python}
+datetime.date(2020, 10, 20)
+```
+
+Today's date:
+
+```{python}
+datetime.date.today()
+```
+
+Accessing year, month and day.
+
+```{python}
+d = datetime.date(2020, 10, 20)
+print(d.year, d.month, d.day)
+```
+
+Parsing a date:
+
+```{python}
+datetime.date.fromisoformat("2020-02-26")
+```
+
+## Date Arithmatic
+
+The datetime module has `timedelta` to add or subtract dates.
+
+The date of yesterday:
+
+```{python}
+datetime.date.today() - datetime.timedelta(days=1)
+```
+
+10 days from `2020-02-25`:
+
+```{python}
+date = datetime.date(2020, 2, 25)
+for i in range(10):
+    d = date + datetime.timedelta(days=i)
+    print(d)
+```
+
+Or the same thing as a list comprehension:
+
+```{python}
+def date_range(start_date, ndays):
+    return [start_date + datetime.timedelta(days=i) for i in range(ndays)]
+
+date = datetime.date(2020, 2, 25)
+date_range(date, 10)
+```
+
+## Formatting Dates
+
+To format the date in YYYY-MM-DD format, we could just convert the date into string or use `isoformat` method.
+
+```{python}
+d = datetime.date(2020, 2, 25)
+print(d)
+print(str(d))
+print(d.isoformat())
+```
+
+The `strftime` method provides a flexible way to format a date.
+
+```{python}
+d = datetime.date(2020, 2, 25)
+print(d.strftime("%Y-%m-%d"))
+print(d.strftime("%a %b %d, %Y"))
+```
+
+Please refer to [strftime.org](https://strftime.org/) to know the for the availble options.

book/cookbook/index.qmd

@@ -0,0 +1,16 @@
+---
+sidebar: cookbook
+listing:
+  contents: "*.qmd"
+  type: table
+  id: sample-listings
+  fields:
+    - title
+---
+# Python Cookbook
+
+
+This is a collection of recipies to solve various tasks in Python.
+
+::: {#sample-listings}
+:::

book/cookbook/tabulate.qmd

@@ -0,0 +1,72 @@
+---
+sidebar: cookbook
+execute:
+  enabled: true
+  cache: true
+---
+
+# Printing Tables with Tabulate
+
+The `tabulate` is a python library with a very simple API to format data as tables.
+
+## Importing `tabulate`
+
+Start with importing the `tabulate` funtion from the `tabulate` module.
+
+```{python}
+from tabulate import tabulate
+```
+
+## Usage
+
+We just need to pass the tabular data to tabulate and it takes care of formatting it as a nice table.
+
+```{python}
+from tabulate import tabulate
+
+data =[
+    ["2023-10-18", "1", "83.25"],
+    ["2023-10-17", "1", "83.22"],
+    ["2023-10-16", "1", "83.25"],
+    ["2023-10-13", "1", "83.27"],
+    ["2023-10-12", "1", "83.24"]]
+
+print(tabulate(data))
+```
+
+We can optionally provide headers as well.
+
+```{python}
+from tabulate import tabulate
+
+headers = ["Date", "USD", "INR"]
+data =[
+    ["2023-10-18", "1", "83.25"],
+    ["2023-10-17", "1", "83.22"],
+    ["2023-10-16", "1", "83.25"],
+    ["2023-10-13", "1", "83.27"],
+    ["2023-10-12", "1", "83.24"]]
+
+print(tabulate(data, headers=headers))
+```
+
+It is also possible to provide data a list of dictionaries instead of a list of lists.
+
+
+```{python}
+from tabulate import tabulate
+
+data =[
+    {"Date": "2023-10-18", "USD": "1", "INR": "83.25"},
+    {"Date": "2023-10-17", "USD": "1", "INR": "83.22"},
+    {"Date": "2023-10-16", "USD": "1", "INR": "83.25"},
+    {"Date": "2023-10-13", "USD": "1", "INR": "83.27"},
+    {"Date": "2023-10-12", "USD": "1", "INR": "83.24"}]
+
+print(tabulate(data, headers="keys"))
+```
+
+## References
+
+* [Tabulate Documentation](https://pypi.org/project/tabulate/)
+