python 技巧让代码更好
一些小技巧可以让python的代码变得简洁一、if 判断条件的简写 常规写法：
condition = True
if condidtion:
x = 1
else:
x = 0
print(x)
优化后：
condition = True x = 1 if condition else 0; print(x)
二、数据格式化
num1 = 10000000000
num2= 100000000
total = num1 + num2
print(total)
#结果是：10100000000
print(f'{total:,}')
#结果是：10,100,000,000
三、文件读取
常规
f = open('text.txt', 'r')
file_contents = f.read()
f.close()words = file_contents.split(' ')
word_count = len(words)
print(word_count)
优化后
with open('text.txt', 'r') as f:
file_contents = f.read()
words = file_contents.split(' ')
word_count = len(words)
print(word_count)
四、带序号的列表遍历
names = ['Rick', 'Jack', 'Sean', 'Summer']
index = 0
for name in names:
print(index, name)
index +=1
#运行结果
#0 Rick
#1 Jack
#2 Sean
#3 Summer
优化后：
names = ['Rick', 'Jack', 'Sean', 'Summer']
for index, name in enumerate(names, start=1):
print(index, name)
# 打印结果
#1 Rick
#2 Jack
#3 Sean
#4 Summer
五、多列表之间的映射
names = ['Peter Parker', 'Clark Kent', 'Wade Wilson', 'Bruce Wayne']
heroes = ['Spiderman', 'Superman', 'Deadpool', 'Batman']
for index, name in enumerate(names):
hero = heroes[index]
print(f'{name} is actually {hero}')
#运行结果
#Peter Parker is actually Spiderman
#Clark Kent is actually Superman
#Wade Wilson is actually Deadpool
#Bruce Wayne is actually Batman
优化：
names = ['Peter Parker', 'Clark Kent', 'Wade Wilson', 'Bruce Wayne']
heroes = ['Spiderman', 'Superman', 'Deadpool', 'Batman']
universes = ['Marvel', 'DC', 'Marvel', 'DC']
for index, name, universe in zip(names,heroes,universes):
print(f'{name} is actually {hero} from {universe}')
#运行结果：
#Spiderman is actually Batman from Marvel
#Superman is actually Batman from DC
#Deadpool is actually Batman from Marvel
#Batman is actually Batman from DC
