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PythonStudy——字符串常用操作 String common operations
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# 1.字符串的索引取值: 字符串[index]
# 正向取值从0编号，反向取值从-1编号
s1 = '123abc呵呵'
print(id(s1)) #
print(s1[0], id(s1[0])) #
t_s = ''
print(id(t_s)) #
# 取出c
print(s1[5], s1[-3])
# 2.字符串拼接
s2 = '你好'
s22 = '帅'
ss2 = s2 + s22
print(ss2, id(s2), id(s22), id(ss2))
# 如果要拼接其他类型
a = 10
b = ""
c = True
# res = "1020True"
res = "%s%s%s" % (a, b, c) # 方法1
print(res)
res = str(a) + b + str(c) # 方法2
print(res)
# 3.字符串长度
s3 = ''
ln1 = s3.__len__()
print(ln1)
ln2 = len(s3)
print(ln2)
# 4.字符串切片: 取子字符串 - [::] - [start_index:end_index:step]
s4 = '123abc呵呵'
sub_s = s4[0:6:]
print(sub_s) # 123abc
sub_s = s4[0:6:2]
print(sub_s) # 13b
sub_s = s4[::-1]
print(sub_s) # 呵呵cba321
sub_s = s4[-1:-6:-1]
print(sub_s) # 呵呵cba
# 5.成员运算：判断某字符串是否在该字符串中
s5 = '123abc呵呵'
ss5 = '12a'
print(ss5 in s5) # False
print(ss5 not in s5) # True
# 6.字符串循环(遍历)
s6 = '123abc呵呵'
for v in s5:
print(v)
