tutil: add function "chunks" - electrum - Electrum Bitcoin wallet
HTML git clone https://git.parazyd.org/electrum
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DIR Files
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DIR Submodules
---
DIR commit 30ffb3d4dca5a0f42473d8e2bd065049d5943e50
DIR parent 1ebfcc0f364ecb806c0ce736a76de8a3256748fd
HTML Author: SomberNight <somber.night@protonmail.com>
Date: Sun, 26 May 2019 04:10:32 +0200
util: add function "chunks"
ttaken from ElectrumX
https://github.com/kyuupichan/electrumx/blob/67111a3c4c812d0550fdba013ac886ad824689df/electrumx/lib/util.py#L149
Diffstat:
M electrum/tests/test_util.py | 8 +++++++-
M electrum/util.py | 8 ++++++++
2 files changed, 15 insertions(+), 1 deletion(-)
---
DIR diff --git a/electrum/tests/test_util.py b/electrum/tests/test_util.py
t@@ -1,7 +1,7 @@
from decimal import Decimal
from electrum.util import (format_satoshis, format_fee_satoshis, parse_URI,
- is_hash256_str)
+ is_hash256_str, chunks)
from . import SequentialTestCase
t@@ -104,3 +104,9 @@ class TestUtil(SequentialTestCase):
self.assertFalse(is_hash256_str('qweqwe'))
self.assertFalse(is_hash256_str(None))
self.assertFalse(is_hash256_str(7))
+
+ def test_chunks(self):
+ self.assertEqual([[1, 2], [3, 4], [5]],
+ list(chunks([1, 2, 3, 4, 5], 2)))
+ with self.assertRaises(ValueError):
+ list(chunks([1, 2, 3], 0))
DIR diff --git a/electrum/util.py b/electrum/util.py
t@@ -520,6 +520,14 @@ def is_non_negative_integer(val) -> bool:
return False
+def chunks(items, size: int):
+ """Break up items, an iterable, into chunks of length size."""
+ if size < 1:
+ raise ValueError(f"size must be positive, not {repr(size)}")
+ for i in range(0, len(items), size):
+ yield items[i: i + size]
+
+
def format_satoshis_plain(x, decimal_point = 8):
"""Display a satoshi amount scaled. Always uses a '.' as a decimal
point and has no thousands separator"""