Author: Carl Friedrich Bolz-Tereick <[email protected]>
Branch: py3.6
Changeset: r97748:8b92f9a32d07
Date: 2019-10-09 15:58 +0200
http://bitbucket.org/pypy/pypy/changeset/8b92f9a32d07/
Log: small improvement: use newlist with a sizehint that is the length of
the previous line
diff --git a/pypy/module/_csv/interp_reader.py
b/pypy/module/_csv/interp_reader.py
--- a/pypy/module/_csv/interp_reader.py
+++ b/pypy/module/_csv/interp_reader.py
@@ -1,4 +1,3 @@
-from rpython.rlib.rstring import UnicodeBuilder
from rpython.rlib.rutf8 import Utf8StringIterator, Utf8StringBuilder
from rpython.rlib import objectmodel
from pypy.interpreter.baseobjspace import W_Root
@@ -22,6 +21,7 @@
self.dialect = dialect
self.w_iter = w_iter
self.line_num = 0
+ self.sizehint = 1 # just used for first line
def iter_w(self):
return self
@@ -52,7 +52,7 @@
def next_w(self):
space = self.space
dialect = self.dialect
- self.fields_w = []
+ self.fields_w = objectmodel.newlist_hint(self.sizehint)
self.numeric_field = False
field_builder = None # valid iff state not in [START_RECORD, EAT_CRNL]
state = START_RECORD
@@ -213,6 +213,8 @@
break
#
w_result = space.newlist(self.fields_w)
+ # assume all lines have the same number of fields
+ self.sizehint = len(self.fields_w)
self.fields_w = None
return w_result
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