midtwo
diff --git a/‎expand/2.py‎
Lines changed: 27 additions & 0 deletions b/‎expand/2.py‎
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+#s = raw_input()
+#i = 0
+#for i in s:
+#    print i
+#raw_input()
+
+#扩展成在字符串中把特定字符替换成规定字符
+import re
+def printReplace(srcStr,word):
+    for letter in srcStr:
+        if letter == word:
+            srcStr = srcStr.replace(letter,'!') #字符串不可更改
+    return srcStr
+
+def printReplace_re(srcStr,word):
+    srcStr=re.sub(word,'!',srcStr)
+    return srcStr
+
+def main():    
+    srcStr = raw_input(u"请输入一个字符串：")
+    destStr=printReplace_re(srcStr,'i')
+    print destStr
+
+
+if __name__ == "__main__":
+    main()
+