int函式能夠

（1）把符合數學格式的數字型字串轉換成整數

（2）把浮點數轉換成整數，但是隻是簡單的取整，而非四捨五入。

舉例：

1 aa = int("124") #Correct

2 print "aa = ", aa #result=124

3 bb = int(123.45) #correct

4 print "bb = ", bb #result=123

5 cc = int("-123.45") #Error,Can"t Convert to int

6 print "cc = ",cc

7 dd = int("34a") #Error,Can"t Convert to int

8 print "dd = ",dd

9 ee = int("12.3") #Error,Can"t Convert to int

10 print ee

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二、float函式將整數和字串轉換成浮點數。

舉例：

1 aa = float("124") #Correct

2 print "aa = ", aa #result = 124.0

3 bb = float("123.45") #Correct

4 print "bb = ", bb #result = 123.45

5 cc = float(-123.6) #Correct

6 print "cc = ",cc #result = -123.6

7 dd = float("-123.34") #Correct

8 print "dd = ",dd #result = -123.34

9 ee = float("123v") #Error,Can"t Convert to float

10 print ee

三、str函式將數字轉換成字元

舉例：

1 aa = str(123.4) #Correct

2 print aa #result = "123.4"

3 bb = str(-124.a) #SyntaxError: invalid syntax

4 print bb

5 cc = str("-123.45") #correct

6 print cc #result = "-123.45"

7 dd = str("ddd") #correct

8 print dd #result = ddd

9 ee = str(-124.3) #correct

10 print ee #result = -124.3