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Useful functions for MecSimCalc.com

Project description

Mecsimcalc v0.1.2 documentation

This library is designed to provide a set of functions for handling and converting various types of data, such as base64 encoded data, Pandas DataFrames, and Pillow images.

General

input_to_file

[Source]
def input_to_file(input_file, metadata = False)

Description:

Converts a base64 encoded string into a file object and metadata

Arguments:

Argument Type Description
input_file str Base64 encoded string, prefixed with metadata
metadata bool (optional) Flag to return metadata with the file. (Defaults to False)

Raises:

Exception Description
ValueError If the input string doesn't contain ';base64,' to separate metadata and file data.

Returns:

Return Type Description Condition
io.BytesIO The decoded file data (The thing you get when you open a file in Python) metadata is False
(io.BytesIO, str) The decoded file data and its metadata metadata is True

Example:

>>> input_file = inputs['file']
>>> file, metadata = input_to_file(input_file, metadata = True)
>>> print(metadata)
data:image/jpeg;base64,
>>> type(file)
<class '_io.BytesIO'>

metadata_to_filetype

[Source]
def metadata_to_filetype(metadata):

Description:

Extracts the file type from the metadata

Arguments:

Argument Type Description
metadata str The metadata string in the form "Data:<MIME type>;base64,"(returned from input_to_file)

Returns:

Return Type Description
str The file type (e.g. "jpeg")

Example:

>>> input_file = inputs['file']
>>> file, metadata = input_to_file(input_file, metadata = True)
>>> print(metadata)
data:image/jpeg;base64,
>>> download_file_type = metadata_to_filetype(metadata)
>>> print(download_file_type)
jpeg

Text

string_to_file

[Source]
def string_to_file(
    text
    filename= "myfile",
    download_text = "Download File",
)

Description:

Generates a downloadable text file containing the given text

Arguments:

Argument Type Description
text str Text to be downloaded
filename str (optional) Name of the download file. (Defaults to "myfile")
download_text str (optional) Text to be displayed as the download link. (Defaults to "Download File")

Raises:

Exception Description
TypeError If the input text is not a string.

Returns:

Return Type Description
str HTML download link

Example:

Python

>>> download_link = string_to_file("Hello World!")
>>> return {"download": download_link}

Jinja2

# outputs.downloadLink is the html download link generated by the function
{{ outputs.download }}

Spreadsheets

file_to_dataframe

[Source]
def file_to_dataframe(file_data):

Description:

Converts a base64 encoded file data into a pandas DataFrame

Arguments:

Argument Type Description
file_data io.BytesIO Decoded file data (e.g. from input_to_file)

Raises:

Exception Description
pd.errors.ParserError If the file data cannot be converted to a DataFrame (i.e. file is not an Excel or CSV file or is corrupted)

Returns:

Return Type Description
pd.DataFrame DataFrame created from file data

Example:

>>> input_file = inputs['file']
>>> decoded_file = input_to_file(input_file)
>>> df = file_to_dataframe(decoded_file)
>>> print(df)
   A  B  C
0  a  b  c
1  d  e  f

input_to_dataframe

[Source]
def input_to_dataframe(file):

Description:

Converts a base64 encoded file data into a pandas DataFrame

Arguments:

Argument Type Description
input_file str Base64 encoded file data
get_file_type bool If True, the function also returns the file type (Defaults to False)

Returns:

Return Type Description Condition
pd.DataFrame DataFrame created from file data get_file_type is False
(pd.DataFrame, str) Tuple containing the DataFrame and the file type get_file_type is True

Example:

>>> input_file = inputs['file']
>>> df, file_type = input_to_dataframe(input_file, get_file_type = True)
>>> print(df)
   A  B  C
0  a  b  c
1  d  e  f
>>> print(file_type)
csv

print_dataframe

[Source]
def print_dataframe(
    df,
    download = False,
    download_text = "Download Table",
    download_file_name = "mytable",
    download_file_type = "csv",
):

Description:

Creates an HTML table and a download link for a given DataFrame

Arguments:

Argument Type Description
df pd.DataFrame DataFrame to be converted
download bool (optional) If True, function returns a download link (Defaults to False)
download_text str (optional) Text to be displayed as the download link (Defaults to "Download File")
download_file_name str (optional) Name of file when downloaded (Defaults to "myfile")
download_file_type str (optional) File type of downloaded file (Defaults to "csv")

Returns:

Return Type Description Condition
str HTML table download is False
Tuple[str, str] (HTML table, HTML download link) download is True

Example:

Python Code:

>>> input_file = inputs['file']
>>> df = input_to_dataframe(input_file)
>>> table, download = print_dataframe(df, download = True, download_file_name = "FunkyTable", download_text = "Download My Funky Table HERE!", download_file_type = "xlsx")
>>> return {
        "table":table,
        "download":download,
    }

Output using Jinja2 Template:

# outputs.table is the HTML table
Displaying Table
{{ outputs.table }}

# outputs.download is the download link
Downloading Table
{{ outputs.download }}

table_to_dataframe

[Source]

Tables

def table_to_dataframe(column_headers, rows) -> pd.DataFrame:

Description:

Create a DataFrame from given rows and column headers

Arguments:

Argument Type Description
column_headers List[str] List of column headers
rows List[List[str]] List of rows to be converted into a DataFrame. Each column is a list of strings

Returns:

Return Type Description
pd.DataFrame DataFrame created from headers and rows

Example:

>>> column_headers = ["A", "B", "C"]
>>> rows = [["a", "b", "c"], ["d", "e", "f"]]
>>> df = table_to_dataframe(column_headers, rows)
>>> print(df)
   A  B  C
0  a  b  c
1  d  e  f

print_table

[Source]
print_table(column_headers, rows):

Description:

Creates an HTML table from given rows and column headers

Arguments:

Argument Type Description
column_headers List[str] List of column headers
rows List[List[str]] List of rows to be converted into a table. Each column is a list of strings

Returns:

Return Type Description
str HTML table created from rows and headers

Example:

Python Code:

>>> column_headers = ["A", "B", "C"]
>>> rows = [["a", "b", "c"], ["d", "e", "f"]]
>>> table = print_table(column_headers, rows)
>>> return {
        "table":table,
    }

Output using Jinja2 Template:

# outputs.table is the HTML table
Displaying Table
{{ outputs.table }}

Images

file_to_PIL

[Source]
def file_to_PIL(file):

Description:

Transforms a file into a Pillow Image object

Arguments:

Argument Type Description
file str Decoded file data (returned from input_to_file)

Raises:

Exception Type Description
ValueError If the file does not contain image data

Returns:

Return Type Description
Image Pillow Image object

Example:

Python Code:

>>> input_file = inputs['file']
>>> decoded_file = input_to_file(input_file)
>>> image = file_to_PIL(decoded_file)
>>> return {
        "image":image,
    }

Output using Jinja2 Template:

# outputs.image is the Pillow Image object
Displaying Image
{{ outputs.image }}

input_to_PIL

[Source]
def input_to_PIL(input_file, get_file_type=False):

Description:

Converts a base64 encoded file data into a pillow image

Arguments:

Argument Type Description
input_file str Base64 encoded file data
get_file_type bool If True, the function also returns the file type (Defaults to False)

Returns:

Return Type Description Condition
PIL.Image.Image Pillow Image object get_file_type is False
Tuple[PIL.Image.Image, str] (pillow image, metadata) get_file_type is True

Example:

>>> input_file = inputs['file']
>>> img, file_type = input_to_PIL(input_file, get_file_type=True)
>>> print(file_type)
jpeg
>>> type(img)
<class 'PIL.JpegImagePlugin.JpegImageFile'>

print_img

[Source]
def print_img(
    img,
    width = 200,
    height = 200,
    original_size = False,
    download = False,
    download_text = "Download Image",
    download_file_name= "myimg",
    download_file_type = "png",
):

Description:

Transforms a Pillow image into an HTML image, with an optional download link

Arguments:

Argument Type Description
img PIL.Image.Image Pillow image
width int (optional) Output width of the image in pixels (Defaults to 200)
height int (optional) Output height of the image in pixels (Defaults to 200)
original_size bool (optional) If True, the HTML image will be displayed in its original size (Defaults to False)
download bool (optional) If True, function returns a download link (Defaults to False)
download_text str (optional) The text to be displayed on the download link (Defaults to "Download Image")
download_file_name str (optional) The name of the image file when downloaded (Defaults to "myimg")
download_file_type str (optional) The file type of the image when downloaded (Defaults to "png")

Returns:

Return Type Description Condition
str HTML image download is False
Tuple[str, str] (HTML image, download link) download is True

Example:

Python Code:

>>> input_file = inputs['file']
>>> img, metadata = input_to_PIL(input_file)
>>> image, download = print_img(img,, original_size = True, download = True, download_text = "Download Image Here", download_file_name = "myimage", download_file_type = "jpeg")
>>> return {
        "image":image,
        "download":download,
    }

Output using Jinja2 Template:

# outputs.image is the HTML image
Displaying Image
{{ outputs.image }}

# outputs.download is the download link
Downloading Image
{{ outputs.download }}

Plots

print_plot

[Source]
def print_plot(
    plot_obj,
    width = 500,
    dpi= 100,
    download= False,
    download_text = "Download Plot",
    download_file_name = "myplot",
)

Description:

Converts a matplotlib.pyplot.axis or matplotlib.figure into an HTML image tag and optionally provides a download link for the image

Arguments:

Argument Type Description
plot_obj axes or figure Matplotlib figure
width int (optional) Output width of the image in pixels (Defaults to 500)
dpi int (optional) Output dpi of the image in pixels (Defaults to 100)
download bool (optional) If True, function returns a download link (Defaults to False)
download_text str (optional) The text to be displayed on the download link (Defaults to "Download Plot")
download_file_name str (optional) The name of the image file when downloaded (Defaults to "myplot")

Returns:

Return Type Description Condition
str HTML image download is False
Tuple[str, str] (HTML image, HTML download link) download is True

Example:

Python Code:

>>> import matplotlib.pyplot as plt
>>> import numpy as np
>>> x = np.linspace(0, 2 * np.pi, 400)
>>> y = np.sin(x)
>>> fig, ax = plt.subplots()
>>> ax.plot(x, y)
>>> ax.set_title('A single plot')
>>> image, download = print_plot(fig, width = 500, dpi = 100, download = True, download_text = "Download Sin Function Plot", download_file_name = "sin(x)")
>>> return {
        "image":image,
        "download":download,
    }

Output using Jinja2 Template:

# outputs.image is the HTML image
Displaying Image
{{ outputs.image }}

# outputs.download is the download link
Downloading Image
{{ outputs.download }}

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