1. Analyzing conditions
python code executed from top to bottom.
if conditions:
Indent 1 statement
elif Condition 2:
(... or write pass key. Do not write any code, prevent the error.)
...
else：
pass
Statement last
2. The three head operations
a = 7
print(True if a > 5 else False )
Another way print (True) if a> 5 else False
It can not be determined with the plurality of elif
3.while cycle and break
a = 0
= [2,3,5,6,8]
while a<5:
print (li [a])
a = a + 1
else:
print ( 'be added later while else') preceding conditions are not met, or the normal execution after execution.
Built-in function len (), the length of the calculated variables.
break terminates the loop.
4. iterative loop
= [2,3,5,6,8]
for i in li:
print(i)
print (parameter) print (i, end = ''), the default wrap.
for i in range(11)：
print(i)
Range (11), to generate a default list of integers from 0 to 10, excluding 11.
range (0,11,2), can be added to step
for i in range(1,21):
if i % 5 == 0:
continue # skip this cycle, the next cycle performed
print(i)
else:
print ( 'is not forcibly interrupted') for loop can also be added else.
iterables for loop, the sequence type may tuples, strings, lists, sets, dictionaries can.
The value of circulating dictionary
di = { 'Name' 1234, 'it', 'SDS', 'receiver': 23}
for i in di.values():
5.linux command
cal view the calendar month
cal -y year view
cal 10 2010 relative to see October 2010
date to view the current time.