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authorGuido van Rossum <guido@python.org>1993-11-08 15:05:21 (GMT)
committerGuido van Rossum <guido@python.org>1993-11-08 15:05:21 (GMT)
commite65cce5eec23812d77a54095209c923937cc3c92 (patch)
treeed0b87870ad9c6278e43acf63685b8823cce018c /Lib/stringold.py
parentdb65a6ce556b1e311d03837fbf85ca52ef2c5d07 (diff)
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* string.py: added rindex(), rfind(); changed index() to interpret
negative start indices starting from the right. * ftplib.py: debug() -> set_debuglevel(); change demo to use __init__(). * os.py: added execl, execlp, and execvp. * lambda.py: removed (now that we have built-in map, reduce, bagof, lambda) * test_b{1,2}.py, testall.out: added tests for bagof, lambda, map, reduce * commands.py: use os, not posix * test_grammar.py: make it easy to disable non-portable int overflow tests * dis.py: don't abuse range()
Diffstat (limited to 'Lib/stringold.py')
-rw-r--r--Lib/stringold.py27
1 files changed, 27 insertions, 0 deletions
diff --git a/Lib/stringold.py b/Lib/stringold.py
index 764c396..afe5bec 100644
--- a/Lib/stringold.py
+++ b/Lib/stringold.py
@@ -100,6 +100,7 @@ def index(s, sub, *args):
if len(args) > 1:
raise TypeError, 'string.index(): too many args'
i = args[0]
+ if i < 0: i = i + len(s)
else:
i = 0
n = len(sub)
@@ -109,6 +110,25 @@ def index(s, sub, *args):
i = i+1
raise index_error, (s, sub) + args
+# Find last substring, raise exception if not found
+def rindex(s, sub, *args):
+ if args:
+ if len(args) > 1:
+ raise TypeError, 'string.rindex(): too many args'
+ i = args[0]
+ if i < 0: i = i + len(s)
+ else:
+ i = 0
+ n = len(sub)
+ m = len(s) + 1 - n
+ r = None
+ while i < m:
+ if sub == s[i:i+n]: r = i
+ i = i+1
+ if r is None:
+ raise index_error, (s, sub) + args
+ return r
+
# Find substring, return -1 if not found
def find(*args):
try:
@@ -116,6 +136,13 @@ def find(*args):
except index_error:
return -1
+# Find last substring, return -1 if not found
+def rfind(*args):
+ try:
+ return apply(rindex, args)
+ except index_error:
+ return -1
+
# Convert string to float
atof_error = 'non-float argument to string.atof'
def atof(str):