The differences between Shell programming and Python programming

Cycle

The representation of a For loop in the shell:
1, the number of paragraph form
For i in {1..10};d o echo $i;d one

2, detailed list (characters and the number of items not many)
For File in file1 file2 file3 file4 file5;do echo $File;d One

3, the existence of the file to cycle
For f in ' ls *.sh ';d o echo $f;d one

The representation of a For loop in Python:

There are two types of Python loops, one of which is the for...in loop, which sequentially iterates through each element in the list or tuple.

>>> names = ['Mic''Bob'jcy'  ] for in names: ...      Print name ... Micbobjcy

For Loop

Range (10) can generate a sequence of 0-10 integers, calculated as follows:

Sum  = 0 for in range    :+ = xprint sum

calculates the sum of 1-10 integers

The second loop is the while loop, which, as long as the condition is satisfied, loops continuously, exiting the loop when the condition is not satisfied.

For example, we want to calculate the sum of all the odd numbers within 100, which can be implemented with a while loop:

sum == while n > 0:    = sum + n    = n-2print sum

While Loop

The loop internal variable is n continuously self-reducing until -1 it becomes, and the while condition is no longer satisfied, and the loop exits.

Conditional judgment

The Python program language specifies any non-0 and non-null (NULL) values of true,0 or NULL to FALSE.

In Python programming, if statements are used in the execution of control programs, in the basic form:

if < condition judgment 1>:    < execute 1>elif < condition 2>    :< execute 2>elif < condition judgment 3>:    < execute 3>else:    < Execute 4>

If Judgment

can also be abbreviated as:

if x:     Print ' True ' as long as X is a non-0 value, a nonempty string, a non-empty list, and so on, it evaluates to true, otherwise false. 

If judgment shorthand

The differences between Shell programming and Python programming