python complex list generation tutorial

This article mainly explains the practical application examples of python list generation! Hope this helps beginners!

1. Complex list-generated HTML table:

Note: Strings can be formatted with %, and %s can be replaced with specified parameterization. The join() method of string can concatenate a list into a string.

Mark the few scores in red:

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59 }
def generate_tr(name , score):
if score < 60
return '%s%s< ;/tr>' % (name, score)
return '%s%s' % (name, score)
tds = [generate_tr(name, score) for name, score in d.iteritems()]
print '

2. Conditional filtering

You can also add if judgment after the for loop of list generation:

Change all strings in the list to uppercase and return, non-string elements Will be ignored

Tips:

1. isintance(x,str) can determine whether the variable x is a string

2. The upper() method of the string can return Capital letters

def toUppers(L):
return [x.upper() for x in L if isinstance(x,str)]

print toUppers(['Hello', 'world', 101])

3. Multi-level expressions

For loops can be nested, so in list generation formulas, you can use multi-level for loops to generate lists

For example: for the strings 'ABC' and '123', you can use two-level village replacement to generate a full arrangement

[n+m for m in 'ABC' for n in '123']

Exercise: Use three levels of nested for loops to find symmetrical 3-digit numbers such as 121

print [100*m+10*n+m for m in range(1,10) for n in range (0,10)]

L=[]
for x in range(1,10):
for y in range(10):
for z in range(1,10):
if x==z:
L.append(100*x+10*y+z)
print L

Course recommendation:

Python online video tutorial

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