数据类型转换
一、int函数能够
（1）把符合数学格式的数字型字符串转换成整数
（2）把浮点数转换成整数，但是只是简单的取整，而非四舍五入。
举例：
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
11
二、float函数将整数和字符串转换成浮点数。
举例：
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函数将数字转换成字符
举例：
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
：
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