sandiprb

# List unique values in a DataFrame column
pd.unique(df.column_name.ravel())

# Convert Series datatype to numeric, getting rid of any non-numeric values
df['col'] = df['col'].astype(str).convert_objects(convert_numeric=True)

# Grab DataFrame rows where column has certain values
valuelist = ['value1', 'value2', 'value3']
df = df[df.column.isin(valuelist)]

sandiprb

function slugify(text)
{
  return text.toString().toLowerCase()
    .replace(/\s+/g, '-')           // Replace spaces with -
    .replace(/[^\w\-]+/g, '')       // Remove all non-word chars
    .replace(/\-\-+/g, '-')         // Replace multiple - with single -
    .replace(/^-+/, '')             // Trim - from start of text
    .replace(/-+$/, '');            // Trim - from end of text
}

sandiprb

1. Connect to your EC2 instance
2. Install zsh : sudo apt-get update && sudo apt-get install zsh -y
3. Edit your passwd configuration file to tell which shell to use for user ubuntu : sudo vim /etc/passwd
4. Look for ubuntu user, and replace bin/bash by bin/zsh
5. Install OhMyZsh : sh -c "$(wget https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh -O -)"
6. Disconnect from your instance and reconnect it.
7. Optional - Set hostname in .zshrc export PROMPT="%{$fg_bold[white]%} %{$bg[red]%}%{$reset_color%} ${PROMPT}"

sandiprb

from django.db.models import Count, Max

unique_fields = ['field_1', 'field_2']

duplicates = (
    MyModel.objects.values(*unique_fields)
    .order_by()
    .annotate(max_id=Max('id'), count_id=Count('id'))
    .filter(count_id__gt=1)
)