Python：模块与数学类函数（Math）

代码：

[root@mysql-me ~]# python
Python 2.6.6 (r266:84292, Jul 23 2015, 15:22:56) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> 2**3
8
>>> 
>>> pow(2,3)
8
>>> 
>>> abs(-293)
293
>>> abs(1/2)
0
>>> abs(1/2.0)
0.5
>>> 
>>> round(1/2)
0.0
>>> 
>>> round(1/2.0)
1.0
>>> 
>>> import math
>>> 
>>> math.floor(1/2.0)
0.0
>>> math.floor(34.3)
34.0
>>> math.floor(34.5)
34.0
>>> 
>>> 
>>> math.ceil(34.4)
35.0
>>> math.ceil(34.5)
35.0
>>> 
>>> 
>>> ce=math.ceil
>>> ce(34.4)
35.0
>>> ce(34.5)
35.0
>>> 
>>> exit()
[root@mysql-me ~]#

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[root@mysql-me ~]# python

Python 2.6.6 (r266:84292, Jul 23 2015, 15:22:56)

[GCC 4.4.7 20120313 (Red Hat 4.4.7-11)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>>

>>> 2**3

8

>>>

>>> pow(2,3)

8

>>>

>>> abs(-293)

293

>>> abs(1/2)

0

>>> abs(1/2.0)

0.5

>>>

>>> round(1/2)

0.0

>>>

>>> round(1/2.0)

1.0

>>>

>>> import math

>>>

>>> math.floor(1/2.0)

0.0

>>> math.floor(34.3)

34.0

>>> math.floor(34.5)

34.0

>>>

>>> math.ceil(34.4)

35.0

>>> math.ceil(34.5)

35.0

>>>

>>> ce=math.ceil

>>> ce(34.4)

35.0

>>> ce(34.5)

35.0

>>>

>>> exit()

[root@mysql-me ~]#

——————————————————
Done。[……]

发表于： 2017年6月30日 2017年6月30日
作者： Adamhuan
分类： Python
标签： abs, cmath, from, improt, math, module, pow, Python, sqrt, 函数, 变量引用函数, 数学, 模块
发表评论: Python：模块与数学类函数（Math）

Python，简单的键盘输入与if比较

代码：

[root@mysql-me python]# cat who_am_i.py 
#!/bin/env python

name = raw_input("Who are you? --> ")

if (cmp(name,"adamhuan")):
   print "Welcome to this Area."
else:
   print "Good morning, Mr.world!"

[root@mysql-me python]# 

[root@mysql-me python]# python who_am_i.py 
Who are you? --> Lenka
Welcome to this Area.
[root@mysql-me python]# 
[root@mysql-me python]# python who_am_i.py 
Who are you? --> Rina    
Welcome to this Area.
[root@mysql-me python]# 
[root@mysql-me python]# python who_am_i.py 
Who are you? --> adamhuan
Good morning, Mr.world!
[root@mysql-me python]#

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[root@mysql-me python]# cat who_am_i.py

#!/bin/env python

name = raw_input("Who are you? --> ")

if (cmp(name,"adamhuan")):

print "Welcome to this Area."

else:

print "Good morning, Mr.world!"

[root@mysql-me python]#

[root@mysql-me python]# python who_am_i.py

Who are you? --> Lenka

Welcome to this Area.

[root@mysql-me python]#

[root@mysql-me python]# python who_am_i.py

Who are you? --> Rina

Welcome to this Area.

[root@mysql-me python]#

[root@mysql-me python]# python who_am_i.py

Who are you? --> adamhuan

Good morning, Mr.world!

[root@mysql-me python]#

————————————————
Done。[……]

发表于： 2017年6月29日 2017年6月29日
作者： Adamhuan
分类： Python
标签： cmp, else, if, Python, raw_input(), 字符串, 字符串比较, 字符串运算, 比较, 键盘输入
Python，简单的键盘输入与if比较有1条评论

Python：数字与表达式

代码：

[root@zabbix-me ~]# python
Python 2.7.5 (default, Jun 17 2014, 18:11:42) 
[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> 1+2
3
>>> 
>>> 9-6
3
>>> 
>>> 3*8
24
>>> 
>>> 2/6
0
>>> 
>>> 2/6.0
0.3333333333333333
>>> 

>>> from __future__ import division;
>>> 
>>> 8/35
0.22857142857142856
>>>

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[root@zabbix-me ~]# python

Python 2.7.5 (default, Jun 17 2014, 18:11:42)

[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>>

>>> 1+2

3

>>>

>>> 9-6

3

>>>

>>> 3*8

24

>>>

>>> 2/6

0

>>>

>>> 2/6.0

0.3333333333333333

>>>

>>> from __future__ import division;

>>>

>>> 8/35

0.22857142857142856

>>>

——————————————
Done。[……]

发表于： 2017年6月29日 2017年6月29日
作者： Adamhuan
分类： Python
标签： __future__, from __future__ import division, Python, 普通除法, 模块, 浮点
发表评论: Python：数字与表达式

英文：Prototype

Prototype

英 [‘prəʊtətaɪp] 美 [‘protə’taɪp]

n. 原型；标准，模范

prototype /’prəutətaip/

n.
- a standard or typical example
  
  he is the pro[……]
  
  Read more

发表于： 2017年6月29日 2017年6月29日
作者： Adamhuan
分类：英文（English）
标签： English, prototype, 例句, 原型, 发音, 同近义词, 用法, 英语, 词汇, 语言学
发表评论: 英文：Prototype

Shell，日期类值的运算

代码：

[root@zabbix-me script]# cat calc_datestr.sh 

str_date="$1"
str_operation="$2"
str_howmuch="$3"

str_result=""

echo "======================"
echo "Source Date String: $str_date"
echo "Operation: $str_operation"
echo "How much = $str_howmuch"
echo "======================"

str_result=`date -d "$str_operation$str_howmuch day $str_date" +%F`

echo "Result is: $str_result"

echo "======================"
echo "Finished."
[root@zabbix-me script]# 
[root@zabbix-me script]# sh calc_datestr.sh 2017-06-30 + 1
======================
Source Date String: 2017-06-30
Operation: +
How much = 1
======================
Result is: 2017-07-01
======================
Finished.
[root@zabbix-me script]# 
[root@zabbix-me script]# sh calc_datestr.sh 2017-06-30 - 1
======================
Source Date String: 2017-06-30
Operation: -
How much = 1
======================
Result is: 2017-06-29
======================
Finished.
[root@zabbix-me script]# 
[root@zabbix-me script]#

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[root@zabbix-me script]# cat calc_datestr.sh

str_date="$1"

str_operation="$2"

str_howmuch="$3"

str_result=""

echo "======================"

echo "Source Date String: $str_date"

echo "Operation: $str_operation"

echo "How much = $str_howmuch"

echo "======================"

str_result=`date -d "$str_operation$str_howmuch day $str_date" +%F`

echo "Result is: $str_result"

echo "======================"

echo "Finished."

[root@zabbix-me script]#

[root@zabbix-me script]# sh calc_datestr.sh 2017-06-30 + 1

======================

Source Date String: 2017-06-30

Operation: +

How much = 1

======================

Result is: 2017-07-01

======================

Finished.

[root@zabbix-me script]#

[root@zabbix-me script]# sh calc_datestr.sh 2017-06-30 - 1

======================

Source Date String: 2017-06-30

Operation: -

How much = 1

======================

Result is: 2017-06-29

======================

Finished.

[root@zabbix-me script]#

——————————————
Done。[……]