一句话Python

一句话Python即在一条语句中添加多个条件,生成满足要求的数据.

1 生成list

通过遍历字符串,生成list.

1.0 strip清洗字符串首尾空格和换行符

• Demo

e = " 我是天蓝蓝 "
# 
default_strip = [element for element in e.strip()] 
print("Type of strip: {}".format(type(e.strip())))
print("Default strip: {}".format(default_strip))

• Result

Type of strip: <class 'str'>
Default strip: ['我', '是', '天', '蓝', '蓝']

• Analysis
  (1) 通过strip去除字符串的首尾的空格;
  (2) 去除空格后,遍历字符串;

1.2 直接遍历字符串

• Demo

e = " 我是天蓝蓝 "
default_strip = [element for element in e] 
print("Type of strip: {}".format(type(e)))
print("Default strip: {}".format(default_strip))

• Result

Type of strip: <class 'str'>
Default strip: [' ', '我', '是', '天', '蓝', '蓝', ' ']

• Analysis
  直接遍历字符串所有元素,未对字符串进行任何处理;

1.3 去除字符串中的空格

• Demo

st = "我是你的宝贝 \n"
li_with_space = [s for s in st]
li_without_space = [s for s in st if s != " "]
print("list with space: {}".format(li_with_space))
print("list without space: {}".format(li_without_space))

• Result

list: ['我', '是', '你', '的', '宝', '贝', ' ', '\n']
list: ['我', '是', '你', '的', '宝', '贝', '\n']

2 获取元素编号

• Demo

train_buckets_scale = [0.435, 0.78, 0.96, 1.0]
bucket = [i for i in range(len(train_buckets_scale))]
bucket_id_min = min([i for i in range(len(train_buckets_scale)) if train_buckets_scale[i] > 0.8])
bucket_id_max = max([i for i in range(len(train_buckets_scale)) if train_buckets_scale[i] > 0.8])
if train_buckets_scale[i] > 0.3]
print("bucket id: {}".format(bucket))
print("bucket id min: {}".format(bucket_id_min))
print("bucket id max: {}".format(bucket_id_max))

• Result

bucket id: [0, 1, 2, 3]
bucket id min: 2
bucket id max: 3

• Analysis
  (1) 语句中加入条件,min获取满足条件的最小值,max获取满足条件的最大值;
  (2) min(2, 3)=2,max(0, 1, 2, 3)=3

3 list转str

• Demo

l = ['我', '是', '你', '的', '宝贝', '\n']
print("type of source data: {}".format(type(l)))
string = "".join(l)
print("type of result: {}".format(type(string)))
print("string: {}".format(string))

• Result

type of source data: <class 'list'>
type of result: <class 'str'>
string: 我是你的宝贝

• Analysis
  (1) 直接通过join即可将list转为str

---