Jeff Epler
4715875cc4
.. leading zeros are required for `frontmatter` to treat them as dates
rather than strings, apparently per the YAML specification.
This was done by script:
```py
import re
import datetime
import pathlib
import sys
import frontmatter
rx = re.compile(r'^(\s*)date_added:.*$', re.M)
for path_str in sys.argv[1:]:
print(path_str)
path = pathlib.Path(path_str)
post = frontmatter.load(path)
date_added = post.get("date_added", "")
if isinstance(date_added, datetime.date):
continue
if isinstance(date_added, str):
try:
date_added = datetime.datetime.strptime(date_added, "%Y-%m-%d")
except ValueError as exc:
print(f"Failed to parse date {date_added} in {path_str}: {exc}")
continue
date_added = date_added.date()
content = path.read_text("utf-8")
new_content = rx.sub(lambda m: f"{m.group(1)}date_added: {date_added}", content)
assert content != new_content
path.write_text(new_content, "utf-8")
```
47 lines
2.1 KiB
Markdown
47 lines
2.1 KiB
Markdown
---
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layout: download
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board_id: "raspberry_pi_4b"
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title: "Raspberry Pi 4 Model B Download"
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name: "Pi 4 Model B"
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manufacturer: "Raspberry Pi"
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board_url:
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- "https://www.raspberrypi.com/products/raspberry-pi-4-model-b/"
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board_image: "raspberry_pi_4b.jpg"
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download_instructions: "https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi"
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downloads_display: true
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blinka: true
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date_added: 2019-06-24
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features:
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- Wi-Fi
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- Bluetooth/BLE
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- Ethernet
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- HDMI/DisplayPort
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- 40-pin GPIO
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- USB 3.0
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---
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The Raspberry Pi 4 Model B is the newest Raspberry Pi computer made, and the Pi Foundation knows you can always make a good thing better! And what could make the Pi 4 better than the 3? How about a faster processor, USB 3.0 ports, and updated Gigabit Ethernet chip with PoE capability? Good guess - that's exactly what they did!
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The Raspberry Pi 4 is the latest product in the Raspberry Pi range, boasting an updated 64-bit quad core processor running at 1.4GHz with built-in metal heatsink, USB 3 ports, dual-band 2.4GHz and 5GHz wireless LAN, faster (300 mbps) Ethernet, and PoE capability via a separate PoE HAT.
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- Broadcom BCM2711, Quad core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
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- 1GB, 2GB or 4GB LPDDR4-2400 SDRAM (depending on model)
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- 2.4 GHz and 5.0 GHz IEEE 802.11ac wireless, Bluetooth 5.0, BLE
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- Gigabit Ethernet
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- 2 USB 3.0 ports; 2 USB 2.0 ports.
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- Raspberry Pi standard 40 pin GPIO header (fully backwards compatible with previous boards)
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- 2 × micro-HDMI ports (up to 4kp60 supported)
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- 2-lane MIPI DSI display port
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- 2-lane MIPI CSI camera port
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- 4-pole stereo audio and composite video port
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- H.265 (4kp60 decode), H264 (1080p60 decode, 1080p30 encode)
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- OpenGL ES 3.0 graphics
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- Micro-SD card slot for loading operating system and data storage
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- 5V DC via USB-C connector (minimum 3A)
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- 5V DC via GPIO header (minimum 3A)
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- Power over Ethernet (PoE) enabled (requires separate PoE HAT)
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- Operating temperature: 0 – 50 degrees C ambient
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- A good quality 2.5A power supply can be used if downstream USB peripherals consume less than 500mA in total.
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## Purchase
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* [Adafruit](https://www.adafruit.com/product/4295)
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