Jan Pipek
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janpipek.bsky.social
Jan Pipek
@janpipek.bsky.social
83 followers 210 following 51 posts
Physicist -> programmer / data scientist from Prague. Occasional hiker, trail runner & photographer. PyData Prague.
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janpipek.bsky.social
Random walks in the neighbourhoods, spring edition #photography #bw
Two hornbeam branches with leaves and drops hanging. A silhouette of a trunk between them. B&W square photo. Dangling oak branch with young leaves. B&W photo. Young beach leaves on a branch against a dark background. B&W photo.
May 7, 2025 at 9:28 AM
janpipek.bsky.social
Random walks in the spring neighbourhood (n out of m)... #photography #mobile
Square photo of wet leaves against sky and blurry tree trunks.
April 23, 2025 at 11:42 AM
janpipek.bsky.social
Z dnešního kurzu #streetphotography od @kevinvton.bsky.social (kevin-v-ton.com) jsme měli za úkol si odnést aspoň jednu kloudnou fotku. Tohle je můj pokus. A kurz byl hodně fajn, doporučuji. #photography #bw
Backlit BW photo of an elderly woman in the Old Town Square, Prague.
March 16, 2025 at 8:24 PM
janpipek.bsky.social
Most probably, the last icy "neighbourhood walks" photo this winter. #photography #mobile
An abstract head-like shape formed from two different ice surface structures. Slightly tainted BW square photo.
March 3, 2025 at 8:11 PM
janpipek.bsky.social
Walks in the neighbourhood... #photography #bw #mobile
Bubble in a frozen puddle, in a shape of thumbs-up. Drawing of a head (the pedestrian sign) on the pavement sprinkled with snow and a trace next to it. Black & white square photo.
February 20, 2025 at 11:51 AM
janpipek.bsky.social
Would this be a good approximation? One note - on my system, even when aggregating over 1e8 calls, the results vary by ~10 %.

Duration of time + range + dict calls: 9.4e-08
Duration of range and dict calls: 4.6e-08
Net difference: 4.8e-08
from time import time big_number = int(1e9) def run_in_local_scope(): # Make the access to time faster (is it?) t = time # Measure the duration of both time(), range and dict calls start_time = t() end_time = {0: t() for _ in range(big_number - 1)} and t() duration_time = (end_time - start_time) / big_number # Measure the duration of the range and dict calls start_rest = t() end_rest = {0: None for _ in range(big_number - 1)} and t() duration_rest = (end_rest - start_rest) / big_number print(f"Duration of time + range + dict calls: {duration_time}") print(f"Duration of range and dict calls: {duration_rest}") print(f"Net difference: {duration_time - duration_rest}") return t run_in_local_scope()
February 7, 2025 at 6:34 PM
janpipek.bsky.social
Ať se vám v roce 2025 daří lépe než mně ve Photoshopu / May your 2025 be better than my Photoshop skills. #HappyNewYear
Three frost-covered logs, coloured to green&red&blue with a New Year's wish inscribed.
January 3, 2025 at 8:19 PM
janpipek.bsky.social
Walks in the neighbourhood(s) during otherwise dull winter inversion. #photography
Twig with frozen moisture against dark tree trunk. B&W square photo. Barbed wire with frozen moisture. B&W square photo. Larch twigs hanging vertically with a lot of frozen moistures on them. Square B&W photo. Frozen leaves. BW square photo.
December 30, 2024 at 3:45 PM
janpipek.bsky.social
And a second batch of pictures... #krkonoše #sněžka #snow #photography
Snow with a small puddle in it. B&W square photo. Two animal-like formations from snow, on twigs. B&W square photo. Sněžka mountain in a distance, partly covered with snow. B&W square photo. Small icicles in a waterfall. B&W square photo.
December 22, 2024 at 5:12 PM
janpipek.bsky.social
The weekend two-day hike in #krkonoše (Svoboda nad Úpou - Dvorský les - Horní Malá Úpa - Sněžka - údolí Bílého Labe - Špindlerův Mlýn) was very nice. #photography
Two stones marking the CZ/PL boundary. Detail of three tree trunks covered by snow. A wide-angle photo of a snow-covered tree against a clear sky with sun. A snow-covered stone in the foreground, Studniční hora in the background.
December 6, 2024 at 5:43 AM
janpipek.bsky.social
The time of the year when leaves and not just leaves fall from #ginkgo trees. The ginkgo fruit has some very partcular odour. #photography
November 19, 2024 at 7:53 AM