For Python, if you want to learn, we suggest you check the website: because I have just decided to collect some time to learn about it, the recommendation may not be the best. I was asked during my previous interview. Are you familiar with linux? For this kind of question: I will always be embarrassed to answer, "I know something ".
However, when I graduated from college, I didn't even install linux virtual machines, let alone unfamiliar systems. Although I understand that this system can be operated entirely through commands. After work, sometimes I write some code and submit it to svn. the server is Linux and I am also running the client on windows. I remember a project that asked me to use shell to start the java program. do you know how I did it at that time? Take their shell and ask where to change it, and then change the path of the java class to be started. OK. I don't understand what it means. At the end of the interview, I had to confess: I don't know much about Linux commands.
Some may say that Linux commands are not difficult. It takes a few days. Now I will also say this to anyone who doesn't understand Linux. However, if I do not take the first step in learning commands. I have to wait for an interview for a long time in the future.
Back to the question, should we learn something that seems useless and is really good?
My answer is: if you do have a license and are willing to invest in yourself, I think it is necessary.
1. this extra study will enrich your weekend.
2. when learning to a certain extent, you will have a new view of things.
3. you have an extra chip during the interview.
4. there is a theory: the more you learn, the more you don't know. (The wider the knowledge, the larger the world you see !)
Like singing in a love song: "We have forgotten to go to a bridge and look at each other in our hearts." I wonder if we forget to go to a bridge, let's take a look somewhere else! Haha
So let's join in the PYTHON world!
Python notes (1)
For Python, if you want to learn, we suggest you check the website: (because I just decided to collect a bit of time to learn about it, the recommendation may not be the best)
Http://book.huihoo.com/pe-into-python/5.4_zh-cn/html/toc/index.html Dive to python
Http://docs.python.org/
Http://woodpecker.org.cn/
Http://code.google.com/intl/zh-CN/edu/languages/google-python-class/introduction.html
I think it's great to get started with python. because of installing a software, you can come to HelloWorld right away!
Maybe we are too old to be excited. In fact, I want to say that python is definitely a language that allows you to easily learn.
1. def is used for function declaration.
The code is as follows:
Def buildConnectionString (params ):
2. import Module: import
The code is as follows:
Import odbchelper
When importing a module, the python compiler goes to the path set by its environment variables to find this module. if the module to be imported is in a custom path, you must put this path in the environment variable first.
The code is as follows:
Import sys
Sys. path. append ('/my/new/path ')
3. if_else statement(Python uses indentation to control code blocks, replacing "{}" in java)
The code is as follows:
If n> 1:
Return n * fib (n-1)
Else:
Print 'end of the line'
Return 1
4. built-in data type List:
List li = ["a", "B", "mpilgrim", "z", "example"]
Use.
A. Use for var in list to traverse A list. Do not add or delete elements during traversal!
The code is as follows:
Squares = [1, 4, 9, 16]
Sum = 0
For num in squares:
Sum + = num
Print sum #30
B. Use in to determine whether an element is in the list:
The code is as follows:
List = ['Larry ', 'Curly', 'Moe']
If 'Curly 'in list:
Print 'Yay
C. list other methods:
The code is as follows:
List. append (elem) -- adds a single element to the end of the list. Common error: does not return the new list, just modifies the original.
List. insert (index, elem) -- inserts the element at the given index, shifting elements to the right.
List. extend (list2) adds the elements in list2 to the end of the list. Using + or + = on a list is similar to using extend ().
List. index (elem) -- searches for the given element from the start of the list and returns its index. throws a ValueError if the element does not appear (use "in" to check without a ValueError ).
List. remove (elem) -- searches for the first instance of the given element and removes it (throws ValueError if not present)
List. sort () -- sorts the list in place (does not return it). (The sorted () function shown below is preferred .)
List. reverse () -- reverses the list in place (does not return it)
List. pop (index) -- removes and returns the element at the given index. Returns the rightmost element if index is omitted (roughly the opposite of append ()).
D. Other examples of list:
The code is as follows:
List = ['Larry ', 'Curly', 'Moe']
List. append ('shemp') # append elem at end
List. insert (0, 'XXX') # insert elem at index 0
List. extend (['yyy', 'zzz']) # add list of elems at end
Print list # ['XXX', 'Larry ', 'Curly', 'Moe', 'shemp', 'yyy', 'zzz']
Print list. index ('Curly ') #2
List. remove ('Curly ') # search and remove that element
List. pop (1) # removes and returns 'Larry'
Print list # ['XXX', 'Moe', 'shemp', 'yyy', 'zzz']
The purpose of this article is to allow more people to learn things they may refuse to learn through various excuses.
I hope you will be inspired by me and take some action!
