如何在Python中的字符串前后添加字符？

Question

I have two variable, one is string and other is list.

string_val = 'CreateTime:1557770979668  {"schema":{"type":"string","optional":false},"payload":"{\"subscriptionId\":\"//blp/mktdata/BLOOMBERG IDENTIFIER?fields=LAST_PRICE\",\"MarketDataEvents\":{\"LAST_PRICE\":50.84}}"}'
list_val = ["25746UCY3 Corp","BBG00JM9XLN6 Equity","CFM0987JKM Pro"]

In desired output, u can observe instead of 'BLOOMBERG IDENTIFIER', element of list_val is inserted. I have tried below code, but not get successful.

for i in range(0,len(list_val)):
    print(len(list_val))
    expect_val = string_val.split('mktdata/',0)[1]  + list_val[i] + string_val.split('?fields',0)[-1]
    print(expect_val)

Desired output:

CreateTime:1557770979668    {"schema":{"type":"string","optional":false},"payload":"{\"subscriptionId\":\"//blp/mktdata/25746UCY3 Corp?fields=LAST_PRICE\",\"MarketDataEvents\":{\"LAST_PRICE\":50.84}}"}
CreateTime:1557770979668    {"schema":{"type":"string","optional":false},"payload":"{\"subscriptionId\":\"//blp/mktdata/BBG00JM9XLN6 Equity?fields=LAST_PRICE\",\"MarketDataEvents\":{\"LAST_PRICE\":50.84}}"}
CreateTime:1557770979668    {"schema":{"type":"string","optional":false},"payload":"{\"subscriptionId\":\"//blp/mktdata/CFM0987JKM Pro?fields=LAST_PRICE\",\"MarketDataEvents\":{\"LAST_PRICE\":50.84}}"}

Please suggest, how can I achieve this?

Answer 1

You can just use .replace(x, y) :

string_val = 'CreateTime:1557770979668  {"schema":{"type":"string","optional":false},"payload":"{\"subscriptionId\":\"//blp/mktdata/BLOOMBERG IDENTIFIER?fields=LAST_PRICE\",\"MarketDataEvents\":{\"LAST_PRICE\":50.84}}"}'
list_val = ["25746UCY3 Corp","BBG00JM9XLN6 Equity","CFM0987JKM Pro"]
for x in list_val:
    print(string_val.replace('BLOOMBERG IDENTIFIER', x))

Output:

CreateTime:1557770979668  {"schema":{"type":"string","optional":false},"payload":"{"subscriptionId":"//blp/mktdata/25746UCY3 Corp?fields=LAST_PRICE","MarketDataEvents":{"LAST_PRICE":50.84}}"}
CreateTime:1557770979668  {"schema":{"type":"string","optional":false},"payload":"{"subscriptionId":"//blp/mktdata/BBG00JM9XLN6 Equity?fields=LAST_PRICE","MarketDataEvents":{"LAST_PRICE":50.84}}"}
CreateTime:1557770979668  {"schema":{"type":"string","optional":false},"payload":"{"subscriptionId":"//blp/mktdata/CFM0987JKM Pro?fields=LAST_PRICE","MarketDataEvents":{"LAST_PRICE":50.84}}"}