frappe-core-utils

To safely calculate percentages and format currency in Frappe Server Scripts, use built-in frappe.utils functions like safe_div, flt, and fmt_money instead of Python stdlib to prevent divide-by-zero and None crashes.

Date calculation in Frappe produces incorrect timezone offsets when using Python stdlib datetime instead of frappe.utils, which natively respects site-specific timezones and locales across multi-tenant deployments.

To validate email strings and resolve safe file paths in Frappe v14, use frappe.utils validation functions and site path resolution utilities to ensure multi-tenant-safe filesystem operations.

You should not use standard Python math and string functions in Frappe whitelisted methods because frappe.utils provides safe conversion functions like cint and rounded that handle empty values and locale-specific formatting.

The best way to avoid production failures when handling date parsing in Frappe v16 is using frappe.utils for locale-aware parsing and relative date formatting instead of Python stdlib equivalents.

You should not use Python's built-in os.path for filesystem operations in Frappe when running multi-tenant sites, as frappe.utils provides multi-tenant-safe filesystem and site path resolution.