day22 Python shelve模块

import shelve

# 新增
# m = shelve.open("database", writeback=True)
# m["k1"] = "v1"
# m.close()

# 查询
m = shelve.open("database", writeback=True)
print(m["k1"]) # v1
m.close()

# 修改
# m = shelve.open("database", writeback=True)
# m["k1"] = "value1"
# m.close()

# 查询
m = shelve.open("database", writeback=True)
print(m["k1"]) # value1
m.close()

# 新增
# m = shelve.open("database", writeback=True)
# m["k2"] = {"k1":"v1","k2":"v2","k3":"v3","k4":{"a1":"b1","a2":"b2"}}
# m.close()

# 查询
m = shelve.open("database", writeback=True)
print(m["k2"]) # value1
m.close()

# 修改
# m = shelve.open("database", writeback=True)
# m["k2"]["k4"]["a2"] = "B" # value1
# m.close()

# 查询
m = shelve.open("database", writeback=True)
print(m["k2"]) # value1
m.close()